Your heavy is empty when you spawn at the beginning of a "match" and after death.
The only way to get heavy ammo is from killing enemies.
Chances are that there will be armor that plays into this as well.
ex) 3 kills net 1 serving of heavy ammo.
Armor with a passive buff = 2 kills net 1 serving of heavy ammo.
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Actualy no, heavy ammo works like weapons in halo. Ammo spawns on the map givving you a reason to keep moving much like snipers, rocket launchers etc in halo. When you die you drop your heavy ammo [not sure if the enemy can pick it up though]. When you kill someone you get your super charged to a point. After killing enough enemies [I dont know if it resets after death] you get your super fully charged and ready for use. So feeding the enem team will become a thing.