The core idea
Stocks and bonds can fall together when the dominant shock is higher inflation or higher real discount rates rather than weaker growth.
What is happening underneath
In that environment, bond yields rise while higher discount rates can reduce equity valuations.
How investors should read it
The traditional negative stock-bond correlation is therefore regime-dependent, not permanent.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.