the trick he does at 2.05 and what he does at around 2.50.
if there are enny tutorials for it or someone just can explain how to do it 
Any*
and the first one is hard to work out because he gets into the mount in fast forward. the second one doesn’t seem that difficult if you just slow it down and take it step by step. starts form a double or nothing with a nth thumb in the closer loop. work it out form there. it is a good skill to develop.