I know this is an old topic but I'm not sure how this works

If I have Vader equipped with expert handling could I do the following actions

1. (Free) barrel roll

2. Evade

3. Target lock

This would give me 3 actions

No, because to get the "free" barrel roll action from Expert Handling, you have to perform the Expert Handling action.

1. Expert Handling (grants free barrel roll action and removes a target lock).

2. Any action on Vader's action bar or from an equipped upgrade that is not Expert handling or Barrel Roll.

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