After giving Ulrich internal injuries that leave him bedridden for 2 weeks, Landon did the same to Winston, who had already been defeated by Henry.
This way, even if they wanted to flee, they would have no way of doing so, except they could crawl faster than a person could run.
Without a doubt, they would be heavily guarded at all times.
But it was better knowing that they wouldn't be able to go anywhere.
Landon had asked if Henry wanted them dead, but Henry refused.
Killing them created more problems for him than keeping them alive.
Why?
Because their mothers and maternal clans were still very much alive and kicking.
Killing them would give too much pressure for him to handle.
In the end, Landon would leave him to rule Deiferus, and the amount of clean-up that he had to do was a LOT.
