The change in his eye color wasn't strong enough for him to even realize that the color had fluctuated, and so he looked at her curiously, because she was looking at him in an odd manner. "What?" He inquired, unable to read her expression and put it with something.
When she replied that he should watch out for her, Bruce smiled, "oh really? Maybe you should be the one watching out for me." He said,teasing her, though he never planned on harming her in the least bit.