Despite the official denial from Hezbollah, let us assume, for the sake of argument, that the drone shot down over Israel indeed belongs to the Party of God [Hezbollah].
This would not be the first time Hezbollah has sent an unmanned drone into Israel. There are specific reasons calculated by Hezbollah and Iran every time [a drone is sent]. Three months ago, Israeli aircraft flew a greater distance than that which separates Israel from Iran, and bombed a target in Sudan.