Siege and StormEdit
After Alina mentions to Mal that she wouldn't know what to do with an army of non-Grisha soldiers, the latter decides to prove his worth by fighting against Grisha in a barn near the Little Palace. The fighting draws spectators eager to bet on the winner.
Eskil is one of the Etherealki that Mal fights against. Although the Squaller has the advantage at the beginning of the fight, he ends up losing.