I have reported illusionary leap and swap mesmer bug/exploit long time ago. It wasnt fixed so far. In sPvP when you use it on gates and swap with illusion it does teleport you on the other side of gates most of the time. Just imagine now in WvW a mesmer place a portal for his squad use an invisibility to get on other side of gates and place portal over there. The whole squad teleports inside and destroy everything on the walls. Has anybody ever tried it?.