Huh, so his very first banishment event was by Tia setting him up for a typical ecchi walk-in scene.
"No, that's..."
Finish your damn sentences. I hate it when this happens. I also don't like that he still pretended to have merely trained in a faraway place. He only started telling her about the exiled skills at the very end.
Seeing that Time Travel tag on this manga has kinda spoiled me, so now I'm assuming the one-use cheat skill he has is a time travel skill, and he'll try to save at least Tia, if not his old party with it. It's extremely rare to kill off seemingly main characters like her this early, so chances are likely she's not dead for good. I'd be very surprised if this doesn't happen.