You just need a Frost on your team with Ice Wave Impedance. Have him use both Snow Globe and Ice Wave on Alad and Zanuka, and they will be nearly immobilized and disabled, giving you sufficient time to down them both.
I mistakenly said that we only went for Zanuka, but the Frost had already downed Alad. As you can see, despite Zanuka being right there, he was slowed down enough such that he couldn't revive Alad.