Al Horford drills buzzer-beating three to end Q1 Celtics on 21-4 run

James Harden banks in a three late - ABC

Al Horford shields his eyes as Darius Bazley throws it down

Marcus Smart single-handedly stops a 2-on-1 fastbreak leading to a Horford dunk on the other end.

Morris misses the layup then Dame comes back and hits another three to cut the lead to 2