"Faithful companion / Without we would certainly fail / Ever vigilant" This was Percival's cue to Mina that they must be off. Snow had detected some people heading their way and it would not do to look suspicious, even if he were a heroic figure. The most villainous of villains would know to dress as a hero. But then...what if his heroic companions were...no, no, it was not possible.
Somewhat troubled, on their way out, Percival asked Mina if she noticed anything amiss with the engine. And if they should try and return later. Perhaps he could keep Snow in the area to alert them of any trespassers and ne'er-do-wells.
He knew not what they should do now. There was no obvious leads and he had no foe to match blades with. It was most vexing.
"Listen. Can you two go to the employee's car near the back of the train? We have found trespassers...well, to be exact, we found the mother of the child that died last night."
What luck! A chance has fallen into their laps. "Truly this is my heroic aura drawing in the next piece of this puzzle! Mina, we must move with haste to see where this clue may lead!"
Even as he said this Percival braced himself inwardly. He had never dealt with a mother who had lost his son, quite the opposite, and he felt a pit in his stomach even as they made their way to her. Still, he could not balk when something as big as this fell into their laps.