I think the biggest thing with Murray being out is that it puts so much more pressure on others like Bogdan and Young to score. Murray's averaged 25 PPG this series, and he had some big buckets in Game 3, and he's also the only reason ATL even sort of made it close in the 2nd half of Game 2 (believe me, I was there, he went nuclear on his own and got ATL to within 8-10 points in a game they should have been blown out by 25+ easily)
Maybe someone else like Hunter steps up?
To me though, the C's need to just put them away. They play no defense, just come out on fire, attack and have them thinking about their vacation plans by halftime. Rebound as well. Don't give them a bunch of 2nd chance points.