As aircraft guns. They weren't tested in other roles until well after he was sentenced and even then only a few.
Irrelevant: the point is that if you don't shoot him, his work can continue and potentially come up with something comparable to the Bazooka or Faust. He already had ideas and even examples of handheld, towed, and self-propelled recoilless weapons and would have four years before the war began and another four during it. Plenty of time for his development to progress to the point of a working weapon.
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