I don't understand your two posts P4s. Did you poker stove it and it shows we are drawing dead?

We need 21% equity to call...

Board: Kd 8s 7s
Dead:

equity win tie pots won pots tied
Hand 0: 28.765% 28.55% 00.21% 74252 555.00 { KsJs }
Hand 1: 33.830% 32.96% 00.87% 85721 2259.00 { 88-77, AsQs, AsTs, As9s, Ts9s, 9s6s, 87s, 6s5s }
Hand 2: 37.405% 36.32% 01.08% 94463 2814.00 { 88-77, K8s-K7s, 87s, K8o-K7o, 87o }

This is a tight range, and it is still a call. The fish has every 2 pair in his range. Throw in some slowplayed AK/AA/KK or some random flushdraws from the fish and our equity increases.
The BB can also have some K8/K7s which increases our equity even more.