They are working out their hierachy right now. If you can separate the newcomer for a while it might help, but since they've already met, you might be better off just letting them work things out. You will have some noise and hissing for a while, but hopefully no outright attacks.

Getting a Comfort Zone plug-in with Feliway and rubbing a drop of Rescue Remedy on the eartips might also help make things a bit more peaceful.
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Smile, it will make them wonder what you are up to!

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