Matthew Poole and continuators on 1 Samuel 14:13

13 And Jonathan climbed up upon his hands, and upon his feet, and his armour-bearer after him : and they fell before Jonathan, and his armourbearer slew after him .

The Philistines could easily have hindred their Ascent, but thought scorn to do it, not questioning but they could cut them off in a moment when they were come up to them according to their invitation.

For being endowed with extraordinary strength and courage, and having with incredible boldness killed the first they met with, and so proceeding with success, it is not strange if the Philistines were both astonished and intimidated; God also struck them with a Panick Terror; and withal, infatuated their Minds, and possibly, put an Evil Spirit among them, which in this universal Confusion made them conceive that there was Treachery amongst themselves, and therefore caused them to sheath their Swords in one anothers Bowels; as appears from v. 16, 20.