I just watched the Chara hit a couple times. As an impartial observer, I have to say that I don't think it was a deliberate attempt to injure. The guy's 6'9". He has the potential to hurt you anytime he hits you. I might be wrong, but I don't think he realized that the Hab was gonna' hit the turnbuckle (or stanchion, or whatever it's called). But one thing is certain: It was a devastating injury. I pray he'll be okay.
On the Powe hit, it was a fairly common occurrence. Powe was facing the boards, bent down somewhat. Smid hit him hard (and unnecessarily) from behind, sending Powe head-first into the boards hard. He was shaken up for a bit, but was able to get off under his own power. And it was clear (at least to me) that Smid felt real bad about it. You could tell from his body language that he was thinking, "Ah, @@@@, why did I do that?!"
I did not see that same body language from Chara; but I don't think he had the intent to injure either.