Bloat is a serious condition with very high mortality rate and not the same as lighter bouts of flatulence. That said, it’s very good that you keep a close eye and intervene at first symptoms. Gas can be very painful for a bunny.
Do you have baby gas drops (simethicone)? They often work very well and fast, too, in about 20-30 minutes. Simethicone plus very gentle tummy massages and a bit of running around are often all it takes to get the gas out. Simethicone is not absorbed by the body but acts locally in the gut and comes out with the poop. It’s recommended by Medirabbit and dr Dana Krempels for gas/tummy trouble.
If he has this problem sort of ongoing or very often, I’d look into his diet. Questions you could ask: Is he getting enough fiber? Is he eating a good amount of grass hay? Is he drinking enough water with his hay?Do his pellets have a high percentage (at least 20%) fiber? Are there some veg or vegs that might not be agreeing with him?
Bunnies can have varying sensitivities and intolerances. F ex my Bam can’t have carrot (the tops are fine though) because it gives him sticky poop.
Running around is very, very good. It helps the intestines move.