Remember to use sticky bombs as deterrents if you’re not using them for anything else. No one wants to run through a doorway full of sticky bombs, so if you haven’t placed any yet, pick a choke point, throw a few in, and run off somewhere else. It can’t hurt.
When using sticky bombs for ambushes, place them in places the enemy won’t see until it’s too late. If you’re guarding a doorway, stick them on the sides or across the top, or if it’s a roller door, you can just put them on the ground on your side. This way less people will consciously avoid your trap and you will end up with more victims.
In the event of an enemy medic using his übercharge, hide behind something (or just stay to the side or behind to avoid becoming a target) and start littering the ground in front of the invulnerable duo with sticky bombs. Place them where you predict they will be in 3 seconds or so, generally towards a control point. If either of the two stand on a sticky bomb, detonate them, and the resulting explosion can launch them a fair distance. If it’s far or high enough, you can break the übercharge link, but if you don’t manage to, simply putting your attackers out of position can reduce their threat and leave them with no chance of retreat when the übercharge wears off.
Speaking of übercharges, the demoman is a fantastic übercharge target when sentry guns need to be cleared out. Call for an übercharge, then run into the room, place 3 sticky bombs at the base of each sentry gun and detonate them. With the sentries out of the way, move your focus to any leftover dispensers and teleporters. After that do what you can to enemy troops.
The demoman’s primary grenade launcher, like the pyro’s flamethrower, can be used to pick disguised enemy spies, although not with quite the same devastating efficiency. Your grenades will pass straight through your teammates, but will explode on contact with an enemy (if they contact on the full). The occasional grenade spam around your teammates can yield surprising results.
If you run out of primary grenades and are in an intense, close-quarters fire fight, it is often better to simply keep reloading and firing, or even pulling out the bottle, than trying to be clever by switching to your sticky bomb launcher. However if you’re good enough, you can fire a couple of stickies behind you in a hallway or other narrow pathway, and after retreating over them your enemy will most likely not follow you. If he does explode him, but in the more likely event that he switches to a ranged weapon, find some cover and reload your primary grenade launcher.
Hitting an enemy on the full with a primary grenade will cause it to explode on impact. If you hit them somewhere around the chest, this will simply do damage, but if the grenade contacts around their knees to their feet, they will be launched into the air as though hit by a soldier’s rocket. Just something to keep in mind for a situation where it might help (it’s good, but tricky, against medics).
