Placing a furnace under a trip wire destroys tripwire

To reproduce:
1) Place a piece of tripwire on the ground.
2) Place a second piece of tripwire on top of the aforementioned piece of tripwire.
3) Remove the first piece of tripwire by breaking it.
4) Without missing a beat, skilfully place a furnace under the now magically suspended second piece of tripwire.
5) Watch in disbelief as the tripwire breaks itself into an entity.
6) Pickup your newly found piece of tripwire and enjoy the rest of your day.