Yes, a wall-run is upwards, a tic-tac is to the side. The reasoning is that multi-step tic-tacs are never really practical, adding more unneccesary movement than anything else. Thus, to denote the word "run" would be a misnomer. Multi-step wallruns, though rare, can be practical when you need them, and you almost always take a second or third step as you pull over the top of the obstacle, thus essentially making it a "run"