If you have enough rage to queue HS/Cleave/Maul, but in the meantime you cast, say, a Hamstring or a Demoralising Roar, bringing you below the required rage to cast the HS/Cleave/Maul, the warr/druid will skip 1 auto attack. Normally the attack should go through.
Reproduce:
Pool 20 rage
In between swings:
Queue Heroic Strike
Cast Hamstring
If you have enough rage to queue HS/Cleave/Maul, but in the meantime you cast, say, a Hamstring or a Demoralising Roar, bringing you below the required rage to cast the HS/Cleave/Maul, the warr/druid will skip 1 auto attack. Normally the attack should go through.
Reproduce: Pool 20 rage In between swings: Queue Heroic Strike Cast Hamstring