* The reason is,
the mine has attribute hidden=true;
when enemy unit moves, the code in BattleInfo.cpp MoveUnit() (line 817) will update the revealed to true;
then in the CGameHandler.cpp handleDamageFromObstacle() (line 4846) is checking , and the condition battleIsObstacleVisibleForSide() will return true, so the effect will not be triggerred.
Resolution:
1. Remove the "revealed=true" in moveUnit(), and in handleDamageFromObstacle, remove the "const" restrict for obstacle, and then update revealed to true;
2. After the takeDamage function, add a pack "BattleObstaclesChanged" to update the obstacle to be "revealed=true".
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