There is no logical explanation we can think of; the hospital in Little Havana is too far away to type a !heal command and then get inside the bank in just 3 seconds. Maybe if a big-ass truck rammed into you at the moment of healing you could possibly end up landing in front of the bank doors, but then I'm 99% sure the command wouldn't be executed because you have to stay around the hospital area for the entire 3 seconds. What's more, I highly doubt you were healed by an admin. Your HP increased to 99 right after the Spaz fired, meaning that you've used some sort of a trainer which automatically restored your HP.