Erik shares Malfoy's surprise, it seems, as the pair's eyes meet almost in unison.

Well. That answers that, then.

A moment later, Erik's squinting against the fog—it occurs to him only now that he should have brought some sort of eyewear, god damn it, it's probably absorbing through his eyes—to give this spectacle the moment of attention it deserves. Only a moment, mind. Tadhg may not even have finished savaging the creature before Erik says, already turning away from the train and the gory business over yonder to head for the truck's cab, "What else are we taking?"

Besides whatever's left of this hideousness, he means. (He's going back for mason jars.)