The outer layer of the (perforated) cockpit area shows signs of being very close to detonation of the warhead, so close that it was touched by expanding hot ball of fire/gases, not only spreaded with shrapnel. The skin is blackened from the smoke, burned, almost scorched by high temperature, there is a pattern of thousands very small craters from light, tiny, high-speed particles.
So maybe the outer layer of fuselage was for a split of second heated to high temperature, to a point where the alluminium alloy was softened and edges of shrapnel holes were bent outwards by air escaping from the pressurised hull ? Or somehow by the external 0,9 Mach airflow ?