The feedback 'belongs' to the question and so is a part of the slide so it will disapear once the slide changes.
If you are making this a timed question why not have the time component built into the question itself. Then they do get the feedback.
Work arounds that I can think of would be:
# Use the question variables to trigger a delayed timed move to the next page giving enough time to read the response.
# Use the question variables to display a response on the next page. In this case question 1 has an extra variable called Q1. The user answers and passes to the next page. On this page an action script onload uses the value in Q1 to open a text block that gives either positive reinforcement to the correct response or feedback on an incorrect response.
The second gives you the most flexibility.

For all of these kind of problems draw yourself a little flow chart mapped against a timebase. Lok at what you want to do and plan it then you will see how to best implement your ideas and where the problems are.