Yep, the increased sense of intimacy that can make somebody feel more obligated to you can also make somebody feel uncomfortable and pressured. It's a technique that can definitely backfire. Using it with strangers won't necessarily give you the result you thought it would. However, I suspect in a "call 911" type of situation the other person is already uncomfortable and it's worth psychologically pulling them closer in order to focus their attention.
I'd worry about karma!