If Teemo (Strategist) reveals Nocturne on his defend ability, can Nocturne be summoned to the Teemo battlefield?

Ruling: Yes, Nocturne can be summoned to the Teemo battlefield when revealed by Teemo's defend ability.

Nuances:

• This assumes the Teemo player controls that battlefield, which is almost always true when the defend trigger happens
• A corner case exists where Strategist wouldn't control the battlefield: active defense where you use an effect like Ride the Wind to move Teemo into an open showdown