I'm stumped by 'don't dead open inside comic'. It could potentially be a cryptic or nonsense phrase used for a unique artistic effect in a particular comic, but without more context, it's impossible to tell for sure.
I have no idea what that phrase means. It seems quite odd and confusing.
Honestly, 'don't dead open inside comic' makes no sense to me. Maybe it's some sort of made-up or garbled language within a specific comic context that I'm not familiar with.