How does Heimerdinger's ability to copy exhaust abilities work, particularly with Lux's exhaust ability?

Ruling: Heimerdinger can use all exhaust abilities from other sources by exhausting himself. The original units/legends/gear do not get exhausted - only Heimerdinger exhausts to activate their abilities.

Sequence:

• Treat all exhaust abilities as if they are printed directly on Heimerdinger
• Exhaust Heimerdinger to activate any of those abilities
• The original source of the ability remains unexhausted

Nuances:

• Heimerdinger copies the speed of each ability (e.g., Lux's ability would be a Reaction when used by Heimerdinger, while Baited Hook would be base speed)
• This includes exhaust abilities from legends, units, and gear