Or, if Bowie was off-leash for a few minutes in the park, it’s possible he could’ve encountered the perpetrator while sniffing around the area, and perhaps that person reacted angrily/violently to the sudden appearance of a pit bull, yelling or threatening the dog (or actually starting to attack him) which would’ve prompted Katie to hurry over to the altercation in an attempt to intervene. If the perp was already attacking Bowie, I doubt Katie would’ve even hesitated before trying to stop the attack and save her dog—which might’ve just further enraged the perpetrator, resulting in the obscene number of injuries that person inflicted on Katie.