I didn't see the flag

was it flagged then was unflagged by others? can it be flagged back? what it will be if some keep flagging and unflagging it?

I saw it [flagged][dead] and vouched for it but I also understand those who flag.

TIL there's a vouche feature. Thanks!

Yeah it exists. It's probably time-gated and karma-gated to avoid abuse.

afaik you can only vouch for dead submissions, not flagged ones