The atmosphere in the "Inside the League" studio was indeed a bit delicate—
Anyone with eyes could see that Bart and Li Wei were at odds.
Although the reason was unclear, everyone present was a professional, and they all knew that the game wasn't over; they had to wait and see what would happen in the second half.
Right now, Bart was just being mouthy for the moment; if the Kansas City Chiefs ended up losing, then everything would be fine, and right and wrong would be dictated by what Bart said; but what if the Kansas City Chiefs won?
Lawson had just offered Bart a way out, which Bart had not accepted, so they simply decided to stand by and watch the excitement, since there's no harm in watching the fun.
It wasn't until Bart had spilled everything he should and shouldn't have said that the other guests began to speak up, diligently fulfilling their roles.