Showing Seek Bar on a lightbox slide

I am wishing there was a seekbar on the lightboxed slide for a completely different reason. I submitted a feature request already, but here's the use case. I have a quiz that is used to enhance learning, more than to "test". They need to pass it, but have unlimited attempts. On each individual question, there are 2 attempts. For the Try Again feedback, there is a hyperlink / trigger to lightbox the slide that contained the answer. This way they can re-watch that slide and find the correct answer for themselves. The problem is that this course is narrated and some slides are multiple minutes long (not my design, I inherited this course). If I lightbox the slide, the learner cannot fast forward or rewind the timeline to hear the parts of the narration or see the portion of the slide they need. this leaves me torn between lightboxing and just linking back to the slide and then letting the learner navigate back to the quiz question  on their own. Both have their downfalls. The video controls don;t help for this use case, though.