FORT WORTH, Texas — No. 25 TCU rose to the occasion Tuesday night and outlasted No. 15 Texas Tech, 85-78, for its third straight Big 12 win and a second straight top-25 victory, this one at Schollmaier Arena. The Horned Frogs overcame a double-digit deficit for a third straight game thanks to a 21-3 run near the end of the first half. The second half became a battle of wills. After leading by as many as 11 points in the second half, the Horned Frogs’ lead was cut to 75-70 with 4 minutes, 7 seconds remaining. TCU scored just one point across the next two minutes, relying on its defense in order…