[MeneMeneTekelUpharsin]

Just pump in some sleeping gas.

He already thought of that. Body weight affects time-of-effect and potential toxicity of any drug. Small boy - much less time and lethal in amounts necessary to sedate adult.

[piasa]

Good point.

There's that gadget that uses sound to incapacitate people, such as an advancing infantry force, but would it work in a bunker?

[TheRhinelander]

Interesting.