"Only one way to find out," She replies, falling back on old patterns, gratefully, "You want to do the honors? Y'know I don't have any patience for this game."

It's true: whenever someone tells her, swearing vehemently, that they'll never talk, she has a tendency to take them at their word. Why waste time arguing with a dead man anyways? She does understand why, intellectually, it's just... It really is just impatience, in the end. Shepard hates being given the runaround more than she hates almost anything that isn't a Reaper.

"I ever tell you about Elias Kelham? Kind of a scumbag, had some information Thane wanted. Beat him unconscious, told his lawyer he could file his complaints at the SPECTRE office," Which wasn't true, really; she'd simply blacked an eye, and pointed out her legal status. White collar criminals are easy to intimidate... but she isn't saying it to inform Garrus, of course. This is all for their audience's benefit, "Not my most impressive display."

Good cop, bad cop. Oldest trick in the book.