Is there an event that fires right when a value leaves a table? [CLOSED]

EDIT: I have solved my issue with the use of coroutines. No answers are needed anymore. Thanks guys.

I have a script, and I need a function to run right when a value leaves a table.

This function would run while it is inside a loop, so using a repeat loop to wait until the value leaves the table would not work, since the script would "pause" until the value leaves.

This is a situation where I need this loop to run at the same time the rest of the script is running.

I'm not requesting a script, I'm simply asking if there's an event that fires right when a value leaves a table, and what it is called.

Thanks in advance.