a trigger brush and point_clientcommand for addcond whatever it is to give people a kritz charge.
Thats the correct answer and how the map will behave! Except that's not what I used in the video
In fact it was a dirty cheat. The candy was a prop_dynamic created by a console command, with an extra one to make it spin. Then a key was bound to give the crit effect (addcond 11) and kill the prop_dynamic at the same time. I pressed they key when I was about to touch the candy to get the effect. The pickup sound and positive response from the soldier were added in post-production
AFAIK, the candy drop is an ammo box entity. It must have some kind of parameter to set it to give crits, but I'm guessing here.