It was said before, Kelce has some kind of withcraft which repeals defenders. Think the 49ers would have expected Bosa to have more of an affect than he's managing.
From the second half kick off there might be ANOTHER knee injury in the Seahawks-Chargers game. Nick Bellore this time; hit his knee on the ground making a tackle.
ETA - Thankfully he was able to run off. Now saying could be a concussion.