Usually is there are not enough staff on standby in the FCC the catagory has to be reduced.
For example, if 2 tenders are off dealing with a fire alarm/first aid call, then the ARFF usually reduce to Cat 6 (I think).
The Cat 8 could have been for them being a guy or 2 down for some reason (sick/injury). I don't know the details of this occurance.
Aircraft that are "Cat 9" or "Cat 10" have to be advised and it's up to the Captain if they continue approach or depart. I have yet to see someone hold, divert or even delay their departure for something like that. I'm sure it happens sometimes though.
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