I’ve had a few similar match ups where the health loss was a far too low and the time far too fast to seem possible. It’s almost impossible to believe your opponent finished the fight that quickly without some heavy boosting or some sort of cheating being involved, I have an r5 ascended Doom with full suicides and can confirm that there’s now way to finish a match that quickly under normal circumstances. Aside from that the fact he has only lost 0.5% is a definitive sign of cheating as on average a non bleed immune champ will loose at least 5% HP before the bleed from double edge runs out. Unfortunately BG’s is rife with cheating but the temporary nature of the matches and the fact there are hundreds if not thousands of matches being played a day make it very hard to detect cheating which is probably why so many do it.