Kellen's eye and hand weren't making any progress. That was what Carlos told him without flinching and what Taylor looked hesitant to say out loud. Kellen could tell. It was in the actions of everyone assisting him and monitoring him. It was upsetting, but not because Kellen wasn't getting better.
Kellen's fate was tied to the fate of those who were still unconscious from the gate.
He knew that Rhys was upset that Kellen wasn't able to use his hand and that he might lose his eye. Kellen was more upset that those he had made sure to save might not actually be saved in the slightest.
