How do I tell a building bobble from a building fall?

Building bobble (0.5): almost drops but is saved. Includes:

• Lowering a stunt from extended to prep level (not a timing issue)
• A base or spotter dropping to the performance surface during a building skill
• A top person leaning or bearing weight on a base or spotter and being pushed back up
• A pyramid skill that would fall without the bracer's support
• The top person's feet (more than one) or hands touching the surface during a cradle or prone
• A drop to the surface onto the feet from a nugget, thigh stand or waist-level stunt (not timing)

Not a bobble: a drop in the top person's body position, excessive base movement when the top stays aligned and height doesn't change, a balance check, an omitted skill, or timing issues.

Building fall (1.0): drops from a building skill or transition, e.g. drops to a cradle, load-in or prone, or a single-based stunt that drops to the surface with help from a base or spotter.

Major building fall (1.5): drops to the performance surface by the top person and/or bases or spotters, e.g. several bases or spotters hit the floor, the top person lands on a base or spotter who goes down, or a single-based stunt's top person lands on the surface without help. A top person who's set down out of a skill and then trips is not a major building fall.

Athlete falls are separate: 0.25 for a hand or knee down (or an incomplete twist) in tumbling or jumps, 0.5 when multiple body parts hit (hands and knees, seat and hands). Tripping while walking in a transition isn't a fall.