BGA

Now I know. I still don't know how to pin him.

Just use normal attacks that will KB him to push him towards the corner. I Slow him and then I do my best to take continuous touch damage while moving him into the corner using Paralyze. It's slow, but it works.

Whats this about paladins "sucks for them" at BGA?

I remember soloing my first BGA at 15x in 15min more or less using only an energizer O.o.

wish i could give you tips but i forgot mostly how i did it

Miss frames are still a bit borked right now, and the "Guard" counts as a Miss, so sometimes you'll get one or two Guards or Misses which don't give off an invincibility frame followed by a Stun. Happens to me quite often.
Doesn't mean it can't be done on a Paladin though.