what was Scarlet Johansson's character talking about to Loki in the cell?

I never got this and I have seen the movie three times. What was she talking to Loki about when and how did that lead her to know whom Loki was trying to set off???

Kris2012-10-09T13:58:27Z

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She was talking about her past and the people she has killed. The red ledger is the"list" of people she has killed while she was a person-for-hire assassin. Hawkeye, however, saved her from that life of senseless killing and have her purpose. Therefore, she owes him a debt. Loki knows all about the ledger however, and claims that saving hawkeye will never erase the bloody ledger. This led to scarlet calling loki a monster, which in turn made loki say that he isn't the monster, they brought the monster. It can be inferred that the monster loki is talking about is bruce banner (the hulk) and this, she figured out what loki was trying to do.