how do you suspend 5 enemies at once for nightwave?

if you've got zephyr, tornado does it too and you barely have to aim. otherwise vauban is the answer.

Vauban's Bastille is the easy way. Drop it in the middle of a group on a low level mission and everything inside gets held up in the air, so five at once happens almost by itself. If you don't own Vauban, take whatever you do have into a crowded survival or defense map so there are enough bodies in one spot.