This achievement's name was a portmanteau of the phrase "saved by the bell" and "blade," referring to the Lawn Mower.
The phrase originally referred to a fear of being buried alive.
It was actually a lot harder to not achieve this in a tough level than achieving it at any level. So, you did not have to worry too much if your purpose was to achieve it. If you tried to look for an easy way, you could have just let a zombie get to the end of the path on purpose.
- The objective of this achievement was the opposite of Lawn No-er's. Thus, this achievement and Lawn No-er could not be unlocked at the same time.