So lasdt night i was playing a Baratheon Asshai deck against a Greyjoy Maester deck and this situation came up.
I won a military challenge and to save a character my opponent knelt Maester Wendamyr, I then played Lord of Light Protect us and had enough Asshai characters to bounce Maester Wendamyr back to his hand. The timing question came up when my opponent wanted to discard an attachment with the Tin Link attachment on Wendamyr, we ruled that he was allowed to discard the attachment before he got bounced back to hand,
i just wanted to clarify