Out of Bounds?

[Rob1968]

Quote: "My player was bumped and lost his balance, left the ball in bounds, returned and placed two feet in bounds and was the first to touch the ball."

So, if the contact caused your player to go out of bounds, while holding the ball, I think, most often, the bump would be judged as sufficient to call a foul. Similarly, if the ball handler, holding the ball, were bumped and the contact caused him to travel, I think, most often, the contact would be judged sufficient to call a foul.
In the scenario from the OP, since there is no "first to touch" rule in HS, some degree of judgement may enter, since the player leaving the court was not a violation, and the player was able to continue normal basketball actions, after returning inbounds.
With the quoted additional explanation of the play, I would be inclined to call the foul.