The trigger that spawns him is located on the front of the building. So I went up from the back. He kept running because it's scripted until he gets to his usual spot.

I just did some tests on Co-op, this can be used for some insane trick launches. What's more, if you let the Zealot get to his spot, you can move him away from the structure and take him anywhere! I plan on making a launch montage featuring him. xD