Try this, from NZ’s government, 2021...
https://www.medsafe.govt.nz/profs/PUArticles/June2021/Anaphylaxis-following-vaccination-Comirnaty.html#:~:text=The%20New%20Zealand%20roll%2Dout,Comirnaty%20vaccine%20in%20New%20Zealand.
That’s not what is being alleged.
Based on my anecdotal experience, anaphylaxis occurs without seconds or minutes. The claims being made as far as can be determined did not happen at the vaccination center.