By Tom Blow & Jack McEachen The Masters semi-final between Mark Allen and Ali Carter was interrupted TWICE due to medical emergencies in the crowd. Carter defeated Allen 6-3 at the Alexandra Palace on Saturday to set up a mouthwatering final with seven-time champion Ronnie O’Sullivan. Carter will be keen to win Sunday’s clash, having lost the 2008 and 2012 World Snooker Championship finals to The Rocket. Both Carter and Allen had to stay seated at the start of the match and again towards the end as the medical emergencies unfolded. In the first instance, both stars were told by the referee abo…