BUG IN KHAL MISSION KILLING SPRAG

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i was facing sprag boss and got told to UNCOVER mines by using the veil cutter thing. i tried but on none of the mines happened something. i tried to use my brother to activate them neighter that worked because the whole controlling of the group was suddenly not able no more. there was no function or whatever and i stuck at the boss again unable to kill it farther than the first bar. slowly its frustrating how bugged these missions are.