Alright, so I know the Stranger isn't reachable physically, but how great of a distance is there between him and Coulson? Also if Coulson were to try and throw various projectiles (snowballs, rocks, whatever he can get his hands on), would anything happen to him? I assume the Stranger's more or less invulnerable, but would there be any blowback that Coulson would experience?

I figure that since Coulson obviously lacks superhuman strength or abilities, anything he throws would fall short, but still. Inquiring minds want to know about any possible repercussions.