The problem is that the higher US Treasury yields soar, the more pressure will be applied on weaker bonds, ultimately causing credit spreads to widen. At that point, it will be too late for risky assets as volatility will become endemic in both the bond and stock market.
One way to know when we might face a broad selloff is to monitor real yields. The faster they rise, the quicker financing conditions are tightening for the corporate space. Real yields remain well below zero. However, as the Federal Reserve prepares to tighten the economy, we can expect breakeven rates to fall and nominal yields to rise, accelerating the rise in real yields. That could provoke a deep selloff, not only within the junk bond space but also in stocks with high duration, such as tech stocks. That's is what happened amid the Taper Tantrum in 2013.