MacIntyre was just three shots off the lead when he hit a wild second shot on the par-five seventh.
Schauffele added a second round of 68 to his record-equalling opening 62 to reach 12 under.
Golf world number one Scottie Scheffler was handcuffed and arrested on Friday after allegedly dragging a police officer with his car while trying to avoid traffic controls outside the PGA Championship at Valhalla.A police report on the incident obtained by ESPN said arresting officer Bryan Gillis says Scheffler disobeyed orders to stop his car and accelerated, dragging the officer to the ground.