I found a pretty cool combo for Sephiroth assist, I've got no video but here it is.
Lance Barrage \/ close to ground - Sephiroth HP (hit early so it does Hell's Gate, and so it hits because it is strict) - Assist Chase (early so opponent fly's past you) - Gungir/Lance Barrage or whatever links up.
Kain can combo that with a BRV assist. Likewise, Lance Barrage ^ near the ceiling. Old news.
I know, what I found cool was that Hell's Gate usually won't hit on a ground WR, but with Kain's the opponent seems to glide just off the floor for a sec. Meh. If it's old news it doesn't really matter I geuss.