Out of bounds?

[tjchamp]

I think this was just in here, but can't find it.

B1's momentum carries him out of bounds at midcourt while he throws ball back in bounds towards his basket. He then takes 3 or 4 steps out of bounds (his momentum direction), tracks down the ball at the free throw line extended, starts dribble and goes in for layup. Legal? Does he need to come back in at the spot he went out? NFHS rules.