A boost is a special kind of aspect, representing an extremely temporary or minor situation. You cannot compel a boost or spend a fate point to invoke it. You may invoke it once for free, after which it vanishes. An unused boost vanishes when the advantage it represents no longer exists, which may be a few seconds or the duration of a single action. They never persist beyond the end of a scene, and you can hold off naming one until you’re using it. If you’re in control of a boost, you may pass it to an ally if there’s rationale for it.

Examples: In My Sights; Distracted; Unstable Footing