Although he finally obtained the result of felling Archer, Berserker thought nothing of it right now. The fiendish steel bird did not even confirm the whereabouts of Archer after he sunk into the river, and with nothing but relentlessness, instead tracked down Saber and mercilessly poured down a rain of 20mm rounds.

For Saber, although the F15 that Berseker spurred on was a completely unknown weapon, her skill of sixth sense, equivalent to precognition, allowed her to comprehend with extreme accuracy the nature of this threat. Just before she was hit by the initial strafing run, Saber had sensed that this attack would result in wide-area destruction. Promptly realizing that Irisviel may be caught in the battle if she stayed on the river bank, she once again leapt onto the water surface and sought a path of retreat on the river.

As this was an unavoidable decision, the result guided her to yet another dilemma.

By good command of footwork as a Servant, Saber would be able to rival a jet fighter in speed and galloped on top of the water. However, this vast river surface, with no obstacles at all, was undoubtedly the best hunting ground for the black knight who strafed down from the air above.

The bullets pouring out like torrential rain swept behind the galloping Saber, missing her by a hair, and scattered raging sheets of water like the streams of an upward waterfall.

Regardless of the size of the caliber, something on the level of mere cannon shells pose no threat to Servants at all. This is especially so with Saber, whose physical abilities would allow her to evade them with no difficulty, and even deflect the shots back with the blade of her sword if she wanted to. However – no matter how extraordinary the Heroic Spirit may be, the 12,000 rounds-per-minute of the pride of America's General Electric, the M61 autocannon, presented an unmanageable amount of shots. Worse yet, as a weapon carrying the properties of a Noble Phantasm due to Berserker’s prana, a single shot would instantly be fatal.

- Fate/Zero: Act 10, Part 5