IMO
Chemical and Biologicals from that height would not be that potent.
A sudden drop in altitude then an EMP strike would be more probable.
True
Cold temps overnight thru Sunday then 48. Crazy
It has a second bladder inside the main helium bladder. It regulating alt taking in 'fresh air' into the small bladder to displace helium - making it heavier.
It could drop alt and deploy a strike I assume.