The easiest conclusion is cheating. And it's far from unlikely.
But because we're talking about Wildcard, where battle illegibility makes combat laughably incoherent, you also have to consider the very real possibility that you were simply being shot at by more than one enemy, and that because you were shooting at your Sparrow, Sparrow was the only one you had the time or the ocular resources to see or comprehend.
I'm not saying people don't cheat, because DO THEY EVER. And if you've played tons of Wildcard and never really had a problem before with seeing, processing, and reacting to everything that happens in those often extremely complicated and congested and FAST encounters, then it may well just have been some form of aimbot. Is there any such cheat as a damage multiplier? Nothing would surprise me anymore. But the most common form of damage multiplication is still a second, usually unseen, shooter.