If you play one you know how irritating it is (particularly in 3v3) when a DPS takes a freezing trap that is intended for a healer or whatever.
This means one less CC for the team and at high ranked games it could easily mean the difference between a win and a loss.
I figured this out by accident when I saw it happen more than once, basically you:
1. Have your focus target (or whoever you want to trap) within range for you to launch an explosive trap (must be glyphed with the knockback)
2. Shortly after scatter him
3. He will be blown away and automatically run back to where the explosive trap was laid, even though he isn't in control of his character
Where does the secret element come in? As soon as a teammate gets scattered he will tell his team on skype, since it's a CC and an indicator that freezing trap will most likely follow The team (whoever is closest) will run to the healer and try to stand on top of him, except the healer will be a.) moving in a straight line (mostly) towards the explosive trap and their team will try to stand on top of where the healer landed (not where he exploded from)
4. Before scatter runs out, place a freezing trap where you KNOW the healer will be (same place the explosive trap was) Train once or two times with a pal in a duel to get the timing appropriate for the explosive trap and scatter.
