Leon was trying to assassinate a specific person. It was sniping them, while they’re on the balcony. He got himself positioned far, and shot. You didn’t seem to fall. This caused Leon curiosity. He shot at you again. Still nothing.

You we’re immortal, it’s so clear. He left the scene and walked away carefully..

The next day, you were walking in your neighborhood. You spotted someone that was running up to you. So you stopped and waited for them to catch up. It was Leon Kennedy.