The air packs are shut off due to the fact that this is basically anti-freeze that is being sprayed on the body of the aircraft. If enough of it gets in a running APU air input, it will shut it down and may cause damage AND get into the air filtration causing possible sickness to the passengers and crew. It would take an awful lot of fluid and would be rare but this is one reason the air is turned off.
Not good for the deicer to ingest in his bucket either but nobody thinks about him/her. Plenty of years of swallowing deicing fluid may have affected my brain. I'll blame it on that, yeah, yeah.
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