Does anyone know what happened to the "other" Angels?

At the time of Lucifer's rebellion against God... many angels chose to stand by his side while most of the others chose to stand by God... but there was a third group who did not know what to do or who to follow... According to some scripture I've read, God was very displeased with these angels and they suffered the same fate as those who stood with Lucifer... but the same scripture tells me that Lucifer also cast them out for not standing by him because he considered them cowards, so they were not brought into Hell to become demons or whatever... (and don't ask for the scripture... it was in a book in High school I read like 100 years ago) so these angels were cast out by both God and Lucifer... so where did they go?, where are they... is there possibly a third group somewhere between demons and angels? (yeah... us, lol)