Megatron starting battle with unstoppable buff

Terminal

The past two times I've encountered a 3 star megatron in arena, he has started the match with an unstoppable buff.

Did something change? I don't see anything listed in his abilities about it.

I thought maybe it was a mastery, but only megs got the buff, the other 2 bots in the series did not.

Dircules

Synergy with Grindor

Terminal

Ah, that must be it. Thanks.

KillMasterC

I'm dropping in to ask why Prowl can sometimes stun with range shots. It isn't mentioned in his abilities and either in his synergies.