Originally posted by TricksterPriest
He means Thor BFRing Hulk w/e Mjolnir. Which he never remembers to do. Which if it weren't for PIS and possible CIS, would be the result of most of the fights between them.
IIRC, Thor once said he requires certain conditions to be met when he creates a portal, such as the stars to be in alignment or something like that. Otherwise any thing could if he were to try that power. So I don't believe it's really so much CIS/PIS than Thor not taking any chances.