Gambit had no issue spotting the escape tunnel, and if he had no problems do it, the bad guys wouldn't either. Kids streaming toward it was kind of obvious. Lorna huddling close while Kitty led the giant bug away left the area vulnerable to more mundane attacks, like guns.
The thief couldn't allow that, much as he thought his skills would be better used in other areas. Kids had to be protected.
A swarm of cards fanned out in the hall before the tunnel entrance, landing on the floor and glowing ominously as Remy moved through them to the tunnel. A gentle hand came down on Lorna's shoulder and a warm breath whispered in her ear, "Tout ira bien, petit. Deep breaths and if you got any interestin' powers ta go wit' that belle shade o' your hair, I suggest you hang back with me and use dem ta protect all these enfants, oui?"