You are playing Campaign Mode.

Action: Discard a hero you control to discard 2 facedown encounter cards from the staging area of a location. Any player may trigger this action. (Limit once per game.)

So it was that Mîm came into the Tale of the Children of Húrin. For he stumbled up on his knees before Túrin's feet and begged for his life. 'I am old,' he said, 'and poor. Only a Dwarf, as you say, not an Orc. Mîm is my name. Do not let them slay me, master, for no cause, as Orcs would.'
–The Children of Húrin

Resolution: If no Grievance objectives were attached to Mîm, the players may either remove one burden from the campaign pool or add Chest of Stone and Wood to the campaign pool. If only one Grievance objective was attached to Mîm you may add Chest of Stone and Wood to the campaign pool. If more than one Grievance objective was attached to Mîm, add Unfading Grief to the campaign pool.

When morning came the storm was passed away eastward over Lothlann, and the sun of autumn rose hot and bright; but the Orcs hating this almost as much as thunder, and believing that Túrin would have fled far from that place and all trace of his flight be washed away, they departed in haste, eager to return to Angband. Far off Gwindor saw them marching northward over the steaming sands of Anfauglith. Thus it came to pass that they returned to Morgoth empty–handed, and left behind them the son of Húrin, who sat crazed and unwitting on the slopes of Taur–nu–Fuin, bearing a burden heavier than their bonds.
–The Children of Húrin