".. huh?"

It's a question that seems to surprise her a little in the middle of a situation like this. But Madoka takes her friend too seriously to question what he's asking her. Surely Romeo would have a good reason for asking that right now of all times, so she nods.

"Yeah, it is!"

See, she's good. Not even asking 'why'. It's better to just get to the action right away, in case those lights might spot them early after all!