Let me just say that AI is broken, this time with obvious biased behaviour and proofs, as THE Valaint it's quite unbelievable that AI is sooo juiced up with no plans to calm it down as it's approaching 6+ months (maybe even more)
This just happened in war few hours ago, Mr Sinister just decided that it will be VERY funny if he just skips the heavy animation and simply uses sp1 because why not? Why go through whole animation which developers have designed when AI can just skip it away LOL.
Here's the gif of Mr Sin skipping heavy animation.

If defenders and MEMEbers aren't convinced yet, then here's the gif of Mr Sin's actual heavy animation, look at that back swing that he does when a player uses heavy but AI? Nope, skips it all, uses special attack and that's it.

Here's the funny part, after AI decides to skip animation parts, Kabam decided, "Hey we know AI is skipping frames for unfair advantage but wouldn't it be funny if design a hero with most obnoxious sp-1 to dex and give him no recovery animation? Heheheh Onslaught."
You try to punish Onslaught and you'll get combo but this wasn't the case before, literally every heroes released before this year had recovery animation after using special attacks but after release of Shocker, Kabam is not even bothering to make recovery animation, you try to punish Shocker sp1, 50-50 chance he will punish you with parry or light attack if you're late by 1 single frame.
STOP. AI. SKIPPING. THINGS. THAT. YOU. DESIGN.