In order to remove the mask from Jason you need:
1.Choose a Shinnok and take him the Imposter style
2. Select Jason’s opponent and Slasher style
3. As Shinnok, lose the first round to Jason
4. In the second round, just beat Jason
5. On the third round, leave Jason health for only one hit and, at the distance of a jump from the enemy, use the “Mimicry” technique PS4 – left, right + square (X) PC -, [A], [J] Xbox One – left, right + X
6 Jason’s mask removed!
P.S For this to work, Shinnok must have open brutality “Face off”
