The whole point of the game was to be a breach and clear and this update really help put that back into the game.
If it is not destroyed the defender will set of the claymore which will either kill the defender or injure them. When they claymore is destroyed it explodes with a very loud sound that alerts the attacker that you are in the area.
With the introduction of claymore roaming will be cut down significantly. With the release of the 4.2 update rainbow six siege has changed significantly.
