Mutant or not, Summer Glau was still fly. But Jubilee didn't correct him because it was obvious that the kid was trying to flirt. If she wasn't a teacher, she might have let it continue. She had no choice though, when Bobby did something.
"The fastest way out is a straight line. Can you hold your breath until I let go?" She asked, grabbing his hand and phasing them. She didn't start pulling him through doors and walls until she got his confirmation.
After that, the scenery became a blur as they ran past and through gun carrying psychos.