prior to season 4 what I think would happen if mary didn't die and the women missed the shot

What happens when issac gets sucked into her life?. dose he break,relapse.or dose he let her help? it is all her mess anyway. right?.

just some agntsy or fluffy one shots spoilers may be ahead for people that havnt watched sherlock bbc if you haven't I request you watch it before reading (requests are open and very apricaited)