Movement skills (all that use mvt points, such as leap, wall wrecker, etc) do not interrupt movement. They're part of it.
Edit: That's not explicit in the rules but seems quite obvious/logical to me. YMMV.
FWIW, that seems to be the general consensus of the forums (but it's not quite unanimous (as nothing ever is!)).
My interpretation is that the movement skills simply modify movement actions as they are happening. e.g. Wall Wrecker allows one, during movement, to spend extra movement points (whether "free movement" or not, or a combination of both) to perform the skill.