As Rob says just use undocumented DeltaYaw and DeltaPitch - much cleaner. I may have mixed my signs up here.
Function PointEnitity (entity1, entity2, speed# ) pitch# = -deltapitch(entity1,entity2) yaw# = -deltayaw (entity1,entity2) turnentity entity1 , pitch * speed , yaw * speed#,0 end function