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Basically, the period or full-stop at the end his ability (after his name) is the important part to remember. If the damage ability you have also ends in a period without any extra conditions (such as
Zap or
Dinobot Swoop's alt mode), then it would have to target Enemy. If the damage ability is more nuanced and conditional (such as
Marksmanship or
Starscream's alt mode), then it doesn't have to target Enemy, but could sometimes still be aimed at him.
This is rule update is a draft, and it could change before finalized.