Luke stopped walking abruptly, almost knocking into K'Tath before he realized that the heavily-equipped lucario was not moving forward anymore. He noticed that the fearsome pokemon was shaking, as if something ahead of them had set him off. Worried, Luke tried to catch a glimpse of whatever was further down the tunnel.
"Hey, K'Tath? What is it? Is there something wrong?" he asked in confusion. He couldn't see whatever it was that had caused the crimson lucario to halt. Then, before K'Tath even had a chance to reply, the Alolan vulpix shot over his shoulder from the entrance to the tunnel and leaped onto K'Tath's back, propelling him forward and down some kind of sliding incline. Shocked by the vulpix's sudden appearance and the empty space that had just opened up in front of him, Luke stumbled forward and felt his paws lose their purchase on the ground.
"W-w-WOAH!" he yelped in panic as he careened forward over the edge, and slid down the slope head first.