That makes sense in terms of how shaped charge warheads work. They usually have to strike a solid object to detonate. Packs, ration cartons, plastic containers, cammo nets, ponchos, clothing, these are all materials that would tend to collapse, give way or be pushed aside by a flying projectile. The plasma jet can't be dissipated if it hasn't yet been formed.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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