You work that close with someone for that long it's always a risk that you get attached. You've got to trust a partner, there's a certain bond and intimacy that's formed -- the best partnerships have some of that and if you want good -- you take the risk.
I'm not describing this experiment.
Generally though, it seems to me she's being methodical about who is getting torture and who isn't. The two that were clean shots? Just guards, these guys? I'm guessing? they've got clearance -- or they did. She probably has it now. Along with whatever she got out of them before they died.