The enemies at Pride Rock work in a different way than most encounters. The way Pride Rock works is it has a set of boundaries, and enemy images are generated outside those boundaries. Then, there are a set number of enemies that are spawned inside those boundaries. I'm not sure how many, but that will be the maximum amount that magnet can attract. I'm not sure whether the level of magnet increases range, but that might also be another factor in your problem. Basically, jump, magnet, jump up and without aerial finish, combo finish the rapid thrusters. I'm not sure if thunder works.