The looting takes a little time. There is not a lot - being early in the campaign season, the only harvest is fresh or left over from winter, so the stores are thin. However, there are weapons and armour that are recoverable. All in all, there are £10 worth of goods and livestock you can take from the place without being particularly cruel, including horses from the manor's herd. You can probably squeeze them for another £2, but that will leave them with little to live on until the harvest comes in.
In addition, you have the lady and two knights as hostages and ransom, and can recover a possible £3 worth of furniture and treasures from the manor if you want to strip in of anything valuable, and £4 worth of coin and jewels from the strong room.
The one slain knight is buried with Christian honours, and your forces are ready to move on.
[Pausing here for any interaction or reports and decisions on how much to squeeze.]
[OOC: This is in addition to what you recovered from the knights directly. There's a case to be made that loot could go to Artaigne and Valka, as well as the ransoms, but Sir Cedwyn would be within his rights to claim it all.]