He looked dead. And Obi-Wan had a moment of panic. A moment where he thought back to the moment that he saw Qui-Gon get stabbed through the chest with Darth Maul's lightsaber.
It was terrifying. He'd just been given the small amount of hope that he might be able to see Qui-Gon alive again. But seeing him passed out on the pilot's seat gave him such a great amount of panic that he let out a small gasp. It gave him flashbacks to how he cradled Qui-Gon to him as the life drained out of his former master. To how Qui-Gon had told him to train Anakin. To how Obi-Wan was clouded with grief and had his brush with the dark side as he slaughtered Darth Maul.
He felt sick. He felt anger coursing through him, wanting to pick up his lightsaber and kill whoever had caused Qui-Gon's downfall for the second time.
And yet he knew that he was alive. Except this didn't help him, for whatever reason. He still felt just as angry.
He still wanted to kill.