Tails was just stupid, seeing you kill a critter and his first reaction was to get away on foot. That caused for the trap you set up to drop him into a red warp ring, sending him to the actively burning Angel Island. He looks around confused, until you say...

You: "Better run."

Tails didn't even bother talking, he ran off the moment he heard it, trying to get away from you. He was trying to find Knuckles since he was on Angel Island, but you gave chase