House of the Dragon teaser trailer (GoT prequel)

DCSaints_Fan said
I'm not sure that solves the issue

1) If it was well known he was loyal to Daemon, enough that he could pose a threat to Alicent, what is he still doing as a sergeant in the City Watch

2) If the gate guards are going to recognize him, why wouldn't the guards in the keep?

And another question, if he was often in the keep, why would he not know who Aemond was on sight?
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The City Watch guards King's Landing not the Red Keep, he has no business at the Keep. The rat catcher was enlisted to help because neither of them would be able to take Aemond 1v1. In any case, Daemon soliciting this duo for an assassination attempt was just a plot device by GRRM to escalate this matter into a full blown war.