The story I heard was when the Israeli panzers launched their counter attack they thought the Egyptian Infantrymen were carrying suitcases. 'They have come prepared to surrender this time' the Israeli crewmen thought, thinking back to the 1967 Six day war when masses of Egyptian infantrymen surrended at first sight of the Israeli's. Que big shock when a number of Israeli panzers went up in flames after they were hit by Sagger AT guided missiles.
It was a real shock and initially caused heavy casualties and a WTF moment.
The simple solutions are usually the best ones on the battlefield. The IDF crews were pretty handy with their vehicle mounted .50s. They adapted their fire and maneuver drills and the Sagger crews were systematically shot to pieces.