Felix sees that realization hit and there's a selfish kind of relief in it. Something for Jim to trouble himself with that isn't getting mad at Felix or questioning how he pulled off this abduction.

"It's all right." His hands squeeze tighter. "It's all right, Jim. We've been gone a day- a couple of days, at most. It's still the beginning of the winter in this universe. Spock and McCoy know the truth, but officially you had- some flu, the doctor named it last night." He'd been too exhausted himself to take in every detail, just trying to explain enough for Jim's concerned friends to let them be.

"He wanted you in sickbay but Spock talked him out of it, thank Stendarr."