Look his face then look at Mckenna's. One is a face of exasperation at the linesman flagging for a decision in favor of Aberdeen, watch the footage Morelos looks at the linesman when he hears the refs whistle, and the other is a face with aggression written all over it.
I don't need to be a mind reader to know what Morelos intent was in that situation if he'd lost his temper and even just had a split second thought that he was going to stamp on or kick Mckenna it would have 100% flashed across his face.