capture, a captive
擒 centers on seizing and holding a person or animal: capturing someone and making them a captive.
擒 combines 扌 (hand) with 禽, which likely contributes both sound and the idea of capturing or a captive. The exact historical development of 禽 is uncertain.
The hand radical 扌 beside 禽 suggests a hand seizing a bird-like creature: capturing it and making it a captive.
For キン, imagine a captor's hand clamping down with a sharp 'kin' sound, like a metal trap snapping shut: kin -> キン, and the captive is caught.
capturing something alive