B did not go from a probable winner to a probable looser
The odds went up (slightly)
Your odds would never go down as a result of a fold
The odds were
Player A: 9♥9♣ - 31%
Player B: A♦Q♦ - 43%
Player C: J♥10♦ - 26%
After C folded
Player A: 9♥9♣ - 56%
Player B: A♦Q♦ - 44%
Consider the 99
As a pair it is currently ahead
But any of 4 cards will beat it - AQJT
There are also straight and flush draws
After the fold the 99 is still ahead
But now now only 2 cards will beat it AQ (and flush and straight)
AQ only went up slightly as it still has to improve to win
If AQ improves to like a pair then JT would need 2 pair or a set and that is just not likely
It was the correct for B to call even though he was behind. He was getting correct pot odds to call.
Jarvis was down to 23 big blinds so he felt like it was time to make move. If he could fold one player out and only facing two overs then a good play. If he cannot fold a player out or facing an over pair then a bad play. That is poker.
I watched the hand again. When B only called you could put him on AQ or lower. AA, KK, JJ, TT, and AK would have raised (against Duhamal a chip leader playing a lot of pots). A was counting on folding out B and C not having a monster. As is turned out C was raising light. When it got to B he should mathematically call unless he is facing AA or QQ and that is not likely. The right mathematical call.