Originally posted by [b]Althares[/b]
http://www.eathena.ws/board/index.php?autocom=bugtracker&showbug=3345
http://irowiki.org/wiki/SnapQUOTE
The caster will be completely unaffected by any obstacles in the way when moving with Snap. Fire Walls will not be harmful. Neither will Traps.
Tested in eathena, and if you snap on top of a trap or firewall, it still affects you.