Does Yi's legend ability apply to all units alone at a battlefield across the whole table, or only at one battlefield?

Ruling: Yi's legend ability applies to all of your units that are alone at a battlefield, but only when defending. Since you can only defend at one battlefield at a time (defending only occurs during a showdown), only one battlefield will be relevant at any given moment.

Nuances:

• The ability boosts might by 2 (it is not a buff)
• Multiple units can qualify if each is alone at their respective battlefield
• Only applies when defending, which happens one battlefield at a time during showdowns