Greetings Jovial,
Rocktapus is referring to using a boolean, and potentially an attribute or true/false to set your 'if' statement.
For example: You can create an attribute either tied to true/false or a number like 0 and 1. When the fall happens, set this attribute to 'true' or '1'. All other times it will be 'false' or '0.' When the fall happens this attribute changes and then triggers your 'updating' event. Just make sure to then set the attribute back to 'false' or '0' at the end of that code block series or it will continue...