The ash all dissolved on the wind, but his fingers still feel gritty and sticky. It might be in his head. Or it might be blood. He does have a lot of injuries that are only technically not fatal.
There's a ship, but it's now on the other side of the planet. If it wasn't crushed by falling debris. He also hasn't the faintest idea how to fly it but that, on the whole, feels like the least of his problems.
Tony Stark stands up and starts walking across the ruins of Titan. He is muttering uncharitable things about dead wizards. Some of them are even justified.