in general, if someone is having a hot streak, just avoid playing with them. Eventually their luck will run out and if its a cash game you'll eventually get his chips. I played a PLO game back in the day where there was some idiot running a .01/.02 table. max $5 buy-in and he had $28 starting. I started with $1, busted a few times - and eventually (after an epic 4-hour cash session with 3 hours of nothing happening) took all the money on the table and was left all alone on an empty table and about $26 (after all the rakes over the 100's of hands)

point is - the stupid always lose. It just may not be to you tonight.