The most recent "S" signal means submissive and ends the 4hr dominance of Bitcoin for the previous dominance signal ("D").
Expect a longer lasting downtrend for Bitcoin from until it gets back to dominating.
You can add the dominance indicator to any of your charts, not just Bitcoin to see how your asset performs while Bitcoin is dominating (click on "Add to favorite scripts" and in "Indicators" pick it from your favs):