Jordan Lavender pulled down nine rebounds, Englehart had six rebounds and Glazer had three assists for the Blazers.
"Several of our guys struggled in the first half," Shives said. "But then they were totally different basketball players in the second half. We found ways to penetrate through the paint. We did not quit tonight and I was happy with that. I was proud of our effort and the way that we came back in the second half."
Boonsboro (1-10, 1-3) led for nearly the entire game and was on top 37-23 with three minutes remaining in the third quarter. After that, Clear Spring went on a 12-7 scoring spurt in the last three minutes of the third quarter to narrow the gap to 44-35.
The Blazers then outscored the Warriors 19-8 during the fourth quarter, including an 8-for-14 performance from the free throw line, to complete the comeback.
Clear Spring trailed 52-49 with 1:30 to go in the fourth quarter when it proceeded to score the final five points of the game on free throws.
Lerch made a pair of free throws to reduce the deficit to 52-51 with 1:21 left in the game. Lavender made the second of his two free throws with 18 seconds remaining to tie the score at 52-52.
When Boonsboro missed a shot, Englehart grabbed the defensive rebound for Clear Spring and was fouled.
Englehart converted both of his free throws with five seconds to go to give the Blazers the lead for good at 54-52, which was their first lead since they made the game-opening basket.
Boonsboro missed a long 3-point attempt at the buzzer to seal the win for Clear Spring.
Keith Welch led Boonsboro with 18 points, including four 3-pointers. Shane Zbir added 10 points and four blocks, while Tyler Walsh had eight rebounds for the Warriors.
"When you are up by 14 points, all that you have to do is take your time and run the offense," Boonsboro coach John Taylor said. "But we kept rushing our shots."
Clear Spring 54, Boonsboro 52
CLEAR SPRING (7-1, 2-1)
Glazer 9, Lerch 11, Thurber 6, Lavender 5, Crist 13, Englehart 10. Totals 19 12-22 54.
BOONSBORO (1-10, 1-3)
Welch 18, Lowery 8, Zbir 10, Walsh 7, Schottman 7, Bonner 2. Totals 20 6-15 52.
Clear Spring 4 10 21 19 -- 54
Boonsboro 11 13 20 8 -- 52
3-point goals --Clear Spring 4 (Lerch 2, Crist 2). Boonsboro 6 (Welch 4, Walsh, Schottman). Fouled out -- Clear Spring (Glazer). JV: Boonsboro 35-29. (Boonsboro: Dylan Eavey -- 10 points. Clear Spring: Mikey Sensenbaugh -- 11 points.)