As of now, Cold Feet does not check whether you have charges or not. If you attempt to cast it with 0 charges, it will fully work.

1. Use up all your Cold Feet charges
2. Refresh the cooldown with -refresh
3. Attempt to cast it while still having 0 charges

Result: It works with 0 charges.

Expected: When attempting to cast with 0 charges, it should disallow you to target with it and give a message saying "No Cold Feet Charges", like how every other charge-based spell does.