An interesting thread.
Marrakai, IMO the photo showing a lock from your Scott is definately showing an Intercepting Sear.
An Intercepting Safety is more likely to only block the (accidental) tumblers fall when the safety catch is on "SAFE" where an intercepting sear can catch the tumbler when the safety catch is on or off.
There are many variations on this principal with some guns also having another system to block the tumbler fall if the top lever is not over far enough, and others which lock the intercepting sears in position so they cannot lift at all when the safety is on safe.