How does undertaker do that choke hold?

Answer 1

I'm not sure but I heard from my mate that he tried to do the triangle choke on viscera but couldn't get his legs round his head peoperly and ended up doing that choke hold and just keeps using it all the time.

Actually, that particular choke hold is called an Oma Plata; an often used choke in both Brazilian Ju Jitsu and the far more popular MMA.

Answer 2

theres 2 undertakers the fake one comes out the door

the will undertaker is under the ring and jumps in thr ring.