Erik may have snapped the coupling out of a fit of pique with the train, but Tadhg is the one who grits his teeth at the noise, and not because of his sensitive hearing. Though really, the presence he senses no doubt had enough of a wake-up call from the righting of the train, so what difference could a little extra sound make? He reaches inward to draw power from his torcs, funneling it through his right fingers into the knife he holds, and through his left palm where it rests on the hilt of his sword, ready to draw.

"'Ware, gentlemen," he warns. "We are not alone." He jerks his chin in the direction of the second carriage. With smooth sideways steps, he angles himself so that he can see as much as can be seen past Malfoy and the now open door, while still keeping his main focus on the whatever-it-may-be.