Trading professionally does not exclude chasing rises and killing declines; it only excludes chasing rises and killing declines without validation.

Many people’s understanding of “chasing rises and killing declines”
stays at impulsively following after large price fluctuations.

But from the perspective of a professional trader,
this definition is too crude.

The truly worthwhile chasing of rises,
is not because the price has already risen,
but because the market has completed an effective breakout at a key level,
and has begun to enter a new trading and pricing zone.

The truly worthwhile execution of killing declines,
is not because the price has already fallen,
but because the original support logic has failed,
the rebound cannot be repaired,
and the downward trend begins to have a higher efficiency for continuation.

Therefore, the so-called chasing rises and killing declines,
if merely reacting to price outcomes, usually has no advantage;
if based on structural confirmation, volatility expansion, and risk re-pricing,
it is a normal part of trend-following trading.