As the episode starts, Yami is calling out for the rest of the gang, trying in vain to warn them how dangerous this new world they've arrived in is. Hearing growling noises, he looks around when he's suddenly attacked by a Trent. As he hops around, avoiding blows, the strange armlet he's wearing pops open. Realising what it's for, he places the capsule that he gained in the previous episode in and fires it, summoning Celtic Guardian to defend him. (thetvdb.com)