Document object lock and some trainer approach

include/bike.h

@@ -71,7 +71,7 @@ void MovePlayerOnBike(u8 direction, u16 newKeys, u16 heldKeys);
 void Bike_TryAcroBikeHistoryUpdate(u16 newKeys, u16 heldKeys);
 bool8 RS_IsRunningDisallowed(u8 tile);
 bool8 IsBikingDisallowedByPlayer(void);
-bool8 player_should_look_direction_be_enforced_upon_movement(void);
+bool8 IsPlayerNotUsingAcroBikeOnBumpySlope(void);
 void GetOnOffBike(u8 transitionFlags);
 void BikeClearState(int newDirHistory, int newAbStartHistory);
 void Bike_UpdateBikeCounterSpeed(u8 counter);