Terry, on a 2-1 count, drove the ball to deep right field to score two go-ahead runs in the Eagles' 4-3 victory over Crane.
"I was just looking for something to hit hard," said Terry. "In my final home game, this was how I wanted it to end."
"Tonight wasn't pretty," said Purdy Coach Joshua Hughes. "It was a great warm-up for district. We really had to dig deep and find a way to win this game. We made some mistakes, but we were able to overcome and persevere."
Terry walked and scored on Riley Veith's double in the first to give Purdy 1-0 lead.
Crane battled back with a run in the third and two runs in the fourth inning.
Veith picked up the win for the Eagles. He pitched six innings, allowed three runs on five hits and struck out 12.
"I didn't feel like I was hitting my spots," said Veith. "We (the seniors) weren't going to allow this team to lose this game. We have reached two of our goals. One was to win conference, and two, was to win our home games."
Purdy struggled to get the clutch hit all night long. The Eagles stranded 10 base runners and had two more runners picked off the base path.
In the sixth inning, Purdy put together a rally. Reese Stevenson walked, and Devon Bennett doubled to set up Terry's at-bat.
Kevin Miller worked a perfect seventh inning to earn the save for the Eagles.
"I feel a lot better," said Miller. "I think we are ready to go to districts and compete for a title."
The first-seeded Purdy Eagles will face eighth-seeded Sarcoxie on Saturday to open district play at Ash Grove. The first pitch is slated for 12:30 p.m.