betta fight torn fins

Hello, these are photos of the beta my parents have been keeping under poor conditions. I knew something was wrong so I took him under my wing. Got a 10 gallon and a heater. These are photos of him in the little bowl and the photos of him when I moved him in the tank. Fast forward 4 days later...

Well I woke up to the best thing this morning. I thought my eyes were playing tricks on me as I saw my one male betta on the side he shouldn't be on. (tank is divided) Then I saw my other betta on the ground not moving. I woke up my girlfriend and we got my silver betta (Ezio in my sig) the heck...