Based on his post semi quote in the race writeup, I would say he assumes Jakob was kicking pretty hard, or at least as hard as him, in the semifinal:
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Kerr was also asked what he made of Ingebrigtsen’s comments anticipating a sprint finish in Tuesday’s final.
“Oh really?” Kerr said. “I would say that’s a bad decision for him, if he saw [what happened] today. I think he might just be saying that just to say it.
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Jakob looked pretty measured/composed to me....the final is going to be awesome.