The complaints about the mines dying prematurely had me wondering, so I've looked into the matter... In the next build, the mines and mortars will be correctly invincible to all damage and will last their intended duration. To make this possible, we had to change the way the mines behave a little bit. They will activate immediately, whether an enemy is nearby or not. To compensate for that, they will last 18s, up from 12s, before expiring. 不用担心,迫击炮和地雷都是绝对无敌的,Zantai自己说了会修正的