That first tank looks like it had already been hit once.
Any comment ?
The first tank goes up with a series of explosions, almost like a roman candle, which I reckon is the magazine going off. So even if the tank had been hit before (which there is no way of telling from the video) this attack has destroyed all the (salvageable) ammo and ensured that the tank is definitely 'beyond use'.
Good work chaps; nice to see the Brimstone warhead being used for its intended purpose!