@JeremyECrawford Can some discern an illusion by seeing someone/thing interact with it, or must they do it themselves
— Thatguy fromtheplace (@Mr_Ahlquist_84) July 2, 2015
As a DM, I allow characters to discern an illusion if they see someone interact with it in an unbelievable way. https://t.co/PxDrtIICkt
— Jeremy Crawford (@JeremyECrawford) July 2, 2015