"Obviously," Strange responds. Normally, he'd try and puff himself up and boost his own ego...but he had witnesses. Lambert saw him wipe the hell out a lot, no need to try and seem like he had it all under control when there's someone who's saw him.

"But with enough practice, I was able to gain control of turning my limbs into smoke and then I expanded it to turn my whole body into smoke. Keep up the work and study and you'll be able to do the same. And, of course, if you want a practice partner, simply ask."

Said as he points at himself. Hey, might as well have the people who can turn into elements help each other out.