Pacers have been beating everyone on their home courts, so IMO game 7 in OKC wouldn't really be a big deal. Crowd noise I suppose could be a factor but that will just push the Pacers to play harder and shut them up.
Game 4 should have been a Pacers victory, idk what makes the Pacers take their foot off the gas but they sure did late in the 4th. Noone wanted to take a shot, just kept passing and settling for shit shots that didn't go in. Very disappointing.
Crowd noise in the home arena somehow makes it difficult for opponents, but it's worth noting that the Pacers have no problem with that in this playoffs. They've played 10 road games, seven of which they've won.
And even though the Pacers have lost a couple of times in this series, those weren't easy wins for the Thunder. So, I think the upcoming games will also be tough for the Thunder, even with the home arena advantage.