ARLINGTON, Texas — Robert Griffin III raised his fists, took a knee for a quick prayer, jumped up, and pointed to the sky.
That’s the routine on touchdown passes for the Heisman Trophy winner from Baylor, and he got to do it four times in his impressive return to Texas. Griffin III threw for 311 yards and Washington built a huge halftime lead against Dallas before holding on for a 38-31 victory on Thursday.
‘‘He’s kind of like ‘Cool Hand Luke,’ ’’ Redskins coach Mike Shanahan said. ‘‘He doesn’t get too upset about anything.’’
Griffin made the Cowboys look like a college team in the second quarter, throwing for three scores in Washington’s first 28-point quarter in 13 years as the Redskins (5-6) built a 28-3 halftime lead.
After Tony Romo threw the longest touchdown pass of his career — an 85-yarder to Dez Bryant late in the third quarter — Griffin answered by becoming the first Redskins quarterback with four touchdown passes in consecutive games.
Romo lost for the first time in six starts on Thanksgiving, despite a career-high 441 yards and three second-half touchdowns. After the long TD to Bryant, who matched his career high from last week with 145 yards receiving, Romo ran in a 2-point conversion following a TD throw to Felix Jones, and threw another scoring pass to Bryant to help Dallas close to 35-28 with 8:24 remaining.
‘‘I thought we had a good chance,’’ said Romo, who tied a career high with 62 pass attempts.
Griffin responded by completing three passes for first downs, including one on third and 1 near midfield — and the Redskins ran nearly 5½ minutes off the clock before Kai Forbath’s 48-yard field goal with 3:03 remaining.