I started feeding a feral cat that's about 6 mos old. First outside and then inside. The cat is very scared of people but I was thinking of trying to rescue it. I'm thinking it won't do well living outside in a NY winter. Anyways today I left the room for a minute and the feral cat ran uptairs and attacked my older indoor cat. Mostly just screeching before I got it out. Now I'm thinking I may not be able to save this cat. Any opinions?