Maybe a more potent gas could do the trick.

Not true, we tried to rinse you out multiple times.

Random Kid: W…w… We were just shooting spit balls! It’s just a straw, please!

ED-209: WEAPON CONFIRMED, ARMING RAIL GUN.

kid reduced to fine red mist

ED-209: TARGET NEUTRALIZED. STATE IF PARENTS SHOULD BE NOTIFIED THROUGH TEXT.

no response

ED-209: VERY WELL, ENJOY THE REST OF YOUR SCHOOL DAY.

drone flies off

He’d probably goose step straight into Poland if he had the stamina