Okay, how long (duration) did it take the resource to finish the 24 hours of work? 3 days? 4 days? As I noted in the other thread, you'll need to make the task Fixed Units or Fixed work first. Then enter the 24 hours of Actual work in the Task Usage view.

As long as the successor task is not constrained with a SNET constraint and both are autoscheduled, the F to S relationship should cause Task 2 schedule to shift, once you drop the duration of Task 1.