If a character has steal energy and can use the ability of quake against multiple targets, does it take 1 click of healing in general or one for each hit target?

I'll let someone more familiar with the ruling give the exact reasoning, but as far as I recall, just 1. There was some theorycrafting about Harley's Hammer on Hellcow that got stamped out.
Of course, if I'm corrected and it turns out you CAN get more, I'd want to confirm that works with Pulse Wave and characters that use Steal Energy at range.

PAC would have answered this. Steal energy is worded when this character hits ONE OR MORE opposing characters with a close attack. Under the old rules you could heal per hit target. Now it’s just one regardless.