Web Warriors and skulls/rerolls

[MaximumEffort]

Can Web Warriors re-roll skulls every time they roll one, or just when conditions allowing for a re-roll would occur (contesting/holding objectives)?

With that, do the skull re-rolls allow them to do so for attacks while they are holding/contesting Objectives?

[Negoldar]

Great Reaponsibility allowing them to reroll failures is permission to break the rule that failures cannot be rerolled. 

They still need a rule that allows them to reroll the die. The first part of Great Responsibility gives them that for a defense die.

When they meet the condition to reroll failures, they may reroll them anytime a relevant rule allows them to reroll including attacks. 

[MaximumEffort]

Thanks!