blew my u-joint out

omg its been over a month of thinking, working on work (taking public trans/bike/gf car), doing nothing, trying various things. I bought a compressor and impact wrench last week and a torch today to try and get that dam big bolt off from the flange. I just got it off after a couple attempts with heat and letting penetrating oil sink in.

Now I dont know how to get the rest of the flange off. Heres what I'm looking at, do I need a tool to grab those teeth and turn the flange? service manual is no help. also is all the oil gona come out when I take that flange off?

maybe I just need to bang on it with a hammer, gona try that now :)