In the right hands and the right situation even the most destructive of powers can be used well.

[Not that she knows about Vash's powers, but well, she's been in that situation before and was able to use her most destructive powers to save the lives of two who were destined to die.]

I'm glad Vash will be fine though.

[And it really does seem like she knows Vash already. Though it has been awhile since they last spoke.]