I'm afraid I think that video just misrepresents how ISO14443A anti-collision works. Most reader devices (like phones, door locks, etc.) will select the tag w

I'm afraid I think that video just misrepresents how ISO14443A anti-collision works. Most reader devices (like phones, door locks, etc.) will select the tag with the best signal (usually = the closest) and deselect others during the anti-collision protocol. This /doesn't/ rule out a malicious reader selecting the other tag, subject to being able to power it.