It never did "grip" (if cats, indeed, grip) at the end, so it couldn't have 'lost' it. You need to refocus the action: perhaps 'misjudged the distance in the leap' or 'didn't complete the leap' or 'didn't make it to the other landing'.
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Anonymous I'm trying to say that the surface was slippery so that cat wasn't able to get its footing or something. Do you know what I mean?I think I've offered my best.