The reason this is such a solid bet is that OKC is in the good zig zag spot here game 3, and getting +4. So......if OKC upsets Mia, game 4 will go up to -5 in a 'must win' spot. But, if Mia wins, the world will say "I guess mia IS the better team!" and the line likely still inflates to 4.25.