A play near the end of the second quarter proved to be particularly controversial. Receiver Kelvin Benjamin caught a pass in the closing seconds of the second quarter that was initially ruled a touchdown by the on-field officials; however, the league's replay official, Alberto Riveron, determined that Benjamin did not have control of the ball until after his foot left the turf and Riveron overturned the touchdown, forcing the Bills to settle for a field goal. Bills owner Terrence Pegula indicated he would protest the decision. Though the first half was close, the Patriots outscored the Bills 24-3 in the second half, culminating in a 37-16 loss for Buffalo.
Question: How many points did Buffalo lose by?
Answer: 21