Pull prop, find you a way to put you a straight edge up ne t to end of prop shaft. Slowly rotate the shaft to see if you bent the shaft. One thing that could have happened is that lick could have put the shaft and gears in a bind that didn’t release until you shut motor off not letting shift dog to slip out. But the raving up has me stumped unless trying to get to neutral you put enough pressure on shifter to make it slip enough to move throttle cable. Pull cowl and work shifter and check to make sure throttle link is moving as it should. In fact think I’d disconnect cable and move it back and forth by hand before starting.
Proud Member of Team Geezer
Charlie Weaver USN/ENC 1965-1979