I haven't got this but i have a hunch:

There are two ways of removing the gem thingy, with jill on the floor, or in the other partners arms. I'm thinking if you get it while its in the other partners arms you will get the trophy (maybe)....but maybe not.

Hmmm....ok then someone else tell us

Also about the heart stopper trophy.

Oh wait, have you done it online?

Ok thanks...do you know how you got the masters of removing thing then?

Its what ded valve said, basically only shoot/tear it off while in the other persons hands.

Thats pretty much what we said

Yeaaah, nice timing

Well most of us got it a long time ago

Haha, so you're a trophy hunter too eh? I've got 4/6 platinums (meaning i've got 4 platinums out of 6 games with trophies) and for the other two (Resistance 2 and LBP) i only need two trophies each but they are all really long. Working on them slowly bit by bit.

Makes me sick when i see someone having about 30 trophy games - not because they only have 30% for each, but because they somehow buy all these games 0_o (ok fine, the 30% thing too )

Back on topic, you don't really need flash rounds/grenades. I never used them, i just ran up to her and used the talk or restrain command - then pull off. Although i think for this trophy you need to only pull it when Jill's in your partner's hands. As for bad blood i've done it many times, but i found out that 3 shots of any weapon is enough, the 4th won't affect him and he'll come running to you. So MGs are a no no Hide, then shoot 3 times, then run up and do the melee combo thing which looks cool. Then when he's on the floor shoot him again - it won't hurt him but it'll make him dash towards you - QTE and if you get it right you punch/kick him. Of course if you get it wrong you'll get hurt, but still if you're good then go for it.