Tell me about a time you drove a project forward without the team's support or a clear mandate.

This screens ownership and bias for action without a mandate, which is the daily reality of an FDE who sees a problem on-site before anyone has scoped or funded it. The failure mode interviewers watch for is the lone hero who 'just did it' and bulldozed people, or the martyr who worked nights to prove a point. The strong answer earns buy-in with a cheap proof and builds a coalition so the work outlives the heroics. Reserved follow-ups: 'what if the proof had failed' (you'd cut it, having spent little) and 'how did you avoid stepping on the owning team' (you made it their win, not a turf grab).