if you plan on betting on a double digit line (IE a team is clearly better than another and should win by double digits), you are much better off betting on the 1st half line
the NBA is one of the worst sports to bet on for blowout games because of how many goddamn times teams score a bunch of points in garbage time to close deficits and blow spreads
that's exactly what you saw in the Miami game, but If you took the first half spread, you would have been fine