[toast0]

Normal maybe isn't the right word, but it's an expected possibility, the FDA has a page about it [1], and that's one reason FDA recommends patients be observed for 15 minutes after a vaccination, especially for types they haven't had before.

[1] https://www.cdc.gov/vaccinesafety/concerns/fainting.html

[snvzz]

Somewhere in EU, I (and everybody else) was told to wait 15m before leaving the area after the vaccine.

This is no doubt because of the possibility of such events.