When hovering over the timeline bar of a replay video, a representative thumbnail appears and instantly updates for that position on the bar, much like Youtube and other video platforms. This would make it easier to skip to key moments in the stream by seeing what's going on visually. Possibly touch/scrub on mobile too? Cons: Would require more storage space for replays since all the thumbnails would need to be stored. Probably a negligible addition compared to the size of the video though.