[Widowmaker750gAMAX]

I was in a map playing when i saw the head of a team mate cruising around! Although it looks Halarious to see just a head flying around he of course was really pissing people off by his killing spree. I asked him how he does that. He showed me. Very simple. I do not approve of nor have any cheat programs ect... My question is that since it is apparent that any player (at least on that server) could do it, I have not tried on any other,though have seen it done. Is it legal since all players have the ability, though just may not know how.? i have also seen people inside of roofs.I personally prefer not to., just looks really funny. can Someone who really knows give me some insight on this?