If Master Yi's player has 2 units at a battlefield and you start a showdown with one of them, then Gust the other unit away, will the remaining unit be retroactively buffed by Yi's effect?

Ruling: Yes, the remaining unit will be buffed. Wuju Bladesman's ability is a passive ability, meaning as long as its condition is true (being the only unit at the battlefield), the effect is active.

Nuances:

• The buff applies retroactively when the condition becomes true mid-showdown
• Passive abilities continuously check their conditions and apply effects accordingly