It happened quickly. (Presumably due to the panic.)
From Shakesphere:
fast (adj.) 1 constant, firm, steadfast
fast (adj.) 2 firm, fixed, definite
fast (adj.) 3 bound, assured, promised
fast (adj.) 4 locked up, firmly bolted
fast (adj.) 5 close, very near [to]
fast (adj.) 6 fast asleep
fast (adv.) 1 constantly, firmly, steadfastly
fast (adv.) 2 tightly, firmly, securely
fast (n.) fasting, hunger
fast (v.) 1 starve, stay empty, go without
[food] fast (v.) 2 do penance
“Fast”
Multiple meanings are valid.
Q can be telling us that things will be/are happening fast.
He might be asking us to upgrade our prayer support from just prayers to FAST as well as pray.
There are other “fast” meanings, and each may possible have a point of validity to what Q is seeking to convey.
Arizona is also a ‘fast’ trip to south of the border if escape is necessary.