RMC has two adds.
The fight
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Have the MT grab Cheroon on the pull and position himself far enough away from the rest of the raid so they don't get AE'd.
Secondary tank strips one of the adds (rescue or reinforcement) on the initial pull and brings it to the dps, who should be clustered together out of the AE range.
Once the first add is dead, the ST should strip the other add and repeat - bringing it back to the dps.
Once both adds are dead, joust or range RMC to death.
Healers should be at max heal range on the MT at all times.
More information is needed.