Situation A: u killed roshan and it was obvious where u guys are, plus they showed themselves on that lane farming creeps, so logically u will go after them.. its common sense.
Situation B: im not so sure about this one, he did leave 2 creeps, but u had more than enough time to stun+toos him from ww and kill him, basically he didnt go back when u came to kill him.. only after 5 secs passed, what could also be some common sense if ur playing safe versus stronger ganking opponents.
imho not enough proof provided
!denied