How are people cheating in battle grounds?

I know bots are a problem in the arena but can they really have bots for some thing like this? I keep losing fights in under 10 seconds. And I have no idea if it has to do with hacking but I’m getting crazy freezes and lag in the middle of matches.
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As for the other one, they have stuff that disables enemy AI and makes their attackers do alot of damage.
Fastest legit matches I've seen are in the 17-18s region and 90% of them are Torch v Mystics