ESPN spent part of Friday previewing a Celtics-Warriors NBA Finals. In the words of another ESPN personality (Lee Corso), “not so fast, my friend.” The Heat season remains alive tonight because Jimmy Butler was Jordanesque, P.J. Tucker was a difference-maker and the Heat’s backcourt finally came to life. Butler’s magical 47-point night carried the Heat to a 111-103 Game 6 win in Boston, sending the Eastern Conference Finals to a deciding seventh game on Sunday night in Miami (8:30 p.m., ESPN). Butler scored 17 of the Heat’s 29 fourth quarter points. The Heat finished 24 for 25 from the free throw line and shot 42.9 percent (15 of 35) on threes. After delivering duds in Games 4 and 5, the Heat surged ahead 79-66 late in the third and then 89-80 early in the fourth before Boston rallied to tie it at 94 on an Al Horford three. After Butler missed a three, Boston’s Derrick White hit a three, giving the Celtics their first lead since late in the second quarter. But with Miami down three, Kyle Lowry tied it with a three, then put the Heat ahead with two free throws, before Marcus Smart tied it again with two free throws. A Bam Adebayo jumper rolled off with three minutes left, and Marcus Smart missed a three.