The Scholars looked to be heading for a defeat when they trailed 2-0 at the break following a close range effort from Ryan McLean and a penalty from Jordan Cole.
But the visitors came out fired up after the break and nearly struck when Langston rattled the crossbar.
The Scholars kept pressing and cut the deficit through Liam Kirton.
Langston then took centre stage as he struck to level the scores.
The momentum was now with the Scholars and an amazing comeback was sealed when Langston netted goals three and four, both from the penalty spot.