Ok, well you know that trick in Death island where you get in the ceiling in the base? Also, you know those triangles in the base that you get in by using crouch jump? Well I got someone by the name of "DPwreck" to crouch in one of those then I went in the ceiling and went on on the triangle

(I was ontop of em) then I started whacking him on the head and he freaked out and shot me, sending me off into the white screened-no where-whatever land. I also filmed the whole thing

You can also get in the triangle without someone in it so that you're standing up....Then press the space bar continuously and it looks like a ST (seisure thing). I have a hella lotta more new stunts but I don't wanna spoil them
Oh I kinda forgot to say how this works....Well, basically, just jump over to the other ledge in the ceiling then jump over to the triangle.
One of the few people who stay up-to-date with halo tricks..Right here.