just getting up and his momentum took him that way. I disagree that it was easy for Atiki to tell that the guy wasn't being aggressive. Atiki is also just getting up and then just sees the guy coming at him, and he's VERY close. I think almost ALL of us would put our arms out in that situation. Just happens that Atiki is way taller than the guy so he connects higher than normal.
A far as the forearm. I simply see that as the same action. He's pushing the guy away that is advancing on him.