He knows full well Bea and Sancho would have run off without releasing any of the prisoners.
Transcript:
Page 15 panel 1
Bradley: Hey-I-found-a–!
Panel 2
(Lysander picks him up in one hand and they run)
Panel 3
(running. Bea and Sancho firing arrows as they run)
Panel 4
(Lysander trying keys in the keyhole of the gate.)
Panel 5
Lysander: (shouting to behind him) None of these work on this gate! Sancho, give me yours!
Panel 6
(they trade places)
Bea: (nervous, arrow notched to bow) Why don’t they work?!
Panel 7
(lock clicks on a cell door of a man with grey hair and a scarred face. Like the Man-at-arms in Darkest Dungeon)
Lysander: Every gate will have a different lock. For security. If we’re lucky, the cell doors will all be the same.
Panel 8
Sancho: (at gate lock) Fookin’ell…
Panel 9
Lysander: Wait, we have to release all the prisoners first.
