The dust he was kicking up wouldn't affect their thermals, but the smoke would. With a mental trigger he set his engines to be at just a bare simmer, spouting out plenty of exhaust to create a thick cloud. This in turn would flare up Reaper's sensors as well, but he did warn him to turn off his thermals. Once a thick enough blanket of smoke was made he cut his jetpack  and ducked into the smoke, seeing if the Litharian traitors would try and venture in. If not, then he would need to give them reason to flee flee inside where he could remove the advantage from their cloaks.