The combat debut of Russia's Arena-M active protection system in late July was recorded here as evidence that the system fails against FPV drones — geolocated footage showed an Arena-fitted T-72B3A destroyed by a drone that its radar-and-interceptor shield did nothing to stop. A second reading of the same footage now complicates that verdict, and the correction is the point: the failure narrative was built on one vehicle's death and missed what the same engagement showed the system doing. Combat drone specialist Dmytro Putiata, who says he and Foreign Policy Research Institute analyst Rob Lee spoke directly with the Ukrainian unit that fought the action near Maiak in Donetsk Oblast, reports that one Arena-M tank — hull number 133 — shot down seven attacking FPV drones in succession before it was killed, and that across the engagement it took 15 to 20 FPVs to destroy an APS-fitted tank against a baseline of three to six for an unprotected one (a 2024 German GIDS study put the figure at 3-6, a 2025 Swedish FOI study at 4-5). Armour analyst Andrei Tarasenko, reading the same Ukrainian Security Service footage, supplies the mechanism of the eventual kill: tank 133 had already expended its interceptors on the earlier drones, so the shield was empty when the fatal drone arrived. That is the system's structural ceiling rather than a malfunction. Arena carries 26 interceptors fired in pairs for 360-degree cover, and BTVT's Andrei_bt notes the magazine cannot be enlarged — more rounds would block the hatch over the engine and transmission compartment that crews need for maintenance. So the defeat is by arithmetic, the same arithmetic that has beaten every previous tank-protection measure in this war: turtle shells, porcupine spikes and cope cages each raised the number of drones needed and none conferred invulnerability, and operators always found they could throw in a few more drones. The analysts divide on what it means. Lee reads a working shield as 'a partial solution to employing armor again' and expects Arena to improve, which would be a genuine reopening of the maneuver question the drone war had closed; Forbes's David Hambling and Andrei_bt read Round 1 of a contest FPVs are structured to win, because a $500 drone made in weeks can be adapted — with decoys, jamming or stealth — far faster and cheaper than a multi-year, roughly $0.5-1m-per-vehicle APS, and single operators now call down whole carousels of drones through systems like Ukraine's Pasika. What is settled is narrower and worth recording plainly: the APS-versus-FPV evidence is no longer one-directional. The shield intercepted drone after drone in real combat; it simply ran out before the drones did. A week of further analysis has since unsettled the ammunition explanation itself, and the correction is worth as much as the first one. Writing on 17 August, David Axe reports that the fielded system was understood to carry twelve charges rather than the twenty-six of the specification — and that Andrei_bt, one of the sceptics above, rejects the twelve-round figure as not matching modern realities, so neither number is settled and the loadout is now the disputed fact. More importantly, the magazine may not be the binding constraint at all. Ukrainian aviation expert Anatolii Khrapchynskyi puts Arena's engagement range at 20 to 30 metres and its detection range at around 50, which against a drone diving from directly above leaves very little time to react however many charges sit in the launchers — a geometry problem that more rounds would not fix, and which no redesign short of a different sensor would. The Institute for the Study of War, the highest-credibility voice in the set, assesses that Arena-M alone is currently insufficient to protect Russian mechanized assaults because the system can be saturated, while granting that it raises the cost and effort demanded of Ukrainian forces — which is the same finding as the fifteen-to-twenty-drone figure, read as a defence rather than as a promise. Czech analyst Jakub Janovsky supplies the arithmetic from the other end: fifteen to twenty FPVs per tank is 'a perfectly viable rate' at which Russia could commit its entire armoured fleet over a few months and produce, in his phrase, a future low-grade iron ore deposit. What keeps the question open is what Arena does not cost. Turtle, porcupine and hedgehog tanks have absorbed more than twenty drones, but their bolted-on plate and bar is extremely heavy, wrecks transmissions, and stops a tank rotating its turret and aiming its gun — it prevents a tank from fighting like a tank. Arena is bulky but light, so it protects without taking the mobility and firepower away, and that is the version of tank protection that would matter, because Russia has spent three years accumulating rebuilt tanks it cannot risk sending anywhere. Tank-led assaults have been rare for the past year while Russian forces leaned on infantry infiltration; whether they return depends less on whether the shield works than on whether it works long enough to cross the ground where the drones are.