Maybe he saw the whole thing happen and raised the gun because he was emotional?
Well in the preview for next weeks episode Carl asks Rick what happened... says he heard a gunshot but didn't see what happened. Rick is kinda struggling for words for a second and then the horde appears over the hill. So I dunno! I don't think he saw but I think his first reaction was that Rick had killed Shane.
I couldn't tell, the zombie that Darryl and other dude killed, was that the prisoner?
So they could all have the zombie bug just waiting in them all. Greaaaaat! Gonna be interesting to see what happens with that.
I felt bad for Shane, that he fell in love with Lori, and lost her in the end. And I think her feelings for him were stronger then those for Rick. But Rick was already the father of her son. In the end perhaps the virus was taking over... or maybe the lovesickness and hopelessness was just too much
So many sad deaths! The group is getting small!