Help :)

[EasyE500]

Im very new to Munchkins but we bought Super Munchkin1+2
and loving it. but cant figure out if this play is legal.

I look for trouble and find Beer Belch +2 "only for males" i play it and instead of looting the room i play a lvl 16 mob from my hand" +2 lvls up 4 tressures. i can easily kill this but i get a duplo ray in the face. and suddely i get 2 of em. i still manage to kill them both so +4 lvls and now the tricky part is it legal to play the Card "Son of..." go trough the discards until you come to the last monster that defeated "witch is the lvl 16 but it gets +5 lvl up for using the Son of... so its lvl 21 is this a legal play ? now someone playes Contrived Escape "play after any succesful combat the foe(s) got away the winner(s) of the combat still get tressure but not the lvls.
if this is all a legal move do i lose what would have given me 6 lvls in one turn
or do i only lose 2 last lvls since that combat is gone and cards have been put in the discard pile and taken out again "with the Son of... ?or what i suspect is that i cant even play the Son of... as i did ?

hope it makes sense :)

cheers Aj.