Mortar lays a Mine wherever your shot makes impact. No-supply Battles are set up so you can't use any supply, including Mines.       If you're in a battle and are unlucky enough to run over an enemy mine that was Mortar-ed in there, you can't use a Repair Kit (remember, no supplies). So, you're an easy kill unless you have an attentive Isida on your team.   This is why, at least for No-supply Battles, Mortar should be reverted to Stock, or given an alternate functio