Points to consider:
1. Would you feel airframe vibration with idle thrust & stationary on the ground? Doubt it.
2. Is N1/N2 = 0% an abnormal indication? Yes.
3. Actioning SEV DAM allows immediate shutdown from memory and prevent further damage. Not a bad idea.
4. On there ground, going no where quickly, is there any reason NOT to action memory items if in doubt? No.
5. Why keep a sick engine running when it is not needed?