Infantry survivability - at the crossroads?

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A well-executed, modern indirect fire strike is over before the targets can know what direction is safer than others.

So if you're caught in the kill zone, you're done.
If you were caught near the kill zone, you'll be perforated while running and be perforated about 1/5th as much while lying.
There's about one second forewarning and five to ten seconds impact, not enough to sprint much more than 50m - not enough to escape the fragmentation zone.

I once was at Fort Sill attending a firepower demonstration. It was quite a while ago--we still had towed 8" in the inventory. The demo was an 8" battalion time on target on a tree line. After the firing finished, the announcer said, "No living thing could have survived that attack." And then, a family of 3 deer came walking out of the trees.