Having seen this several times a week, why were ticket gates so
designed so that if someone bunged in a paper ticket which the gate
rejected Seek Assistance, it is possible and even probable that a
too-fast person behind can insert their ticket which lets the rejected
person through and traps the eager beaver? Every time I see this, the
one left behind wails to staff, they wave their supposedly valid
ticket and are let in, so I guess the lucky one in front has to find
another victim at exit, vault the gate, use an unguarded station.

Is it not possible to "eject" the failed person (as it were) before
allowing a ticket to be inserted after a rejected one?
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