Considering Tony was the one in danger when you walked into it? I'm not all that surprised you could do what you needed to, to protect him. Especially since Extremis seemed to give you just the edge you needed to accomplish it.

[ She'd always suspected that Pepper could be capable of amazing things. She'd seen her handle Tony with an adeptness that could leave even Coulson utterly speechless - an impressive feat, that - and the way the woman had dealt with Hammer at the Stark Expo had more than secured Natasha's deep respect for her. ]