when you read, you can choose between some different modes.
there's the long strip mode, the double page mode...
i recomend using the double page mode in every manga, but especially in tg :re.
there's many panels that become extremely nonsense out the double page mode.
he decided after he remenbered who he was. probably after all that tsukiyama operation he started to wait for an opportunity to stylish die. and he founded it when the ccg forces were divided and he was designed to defend the cochlea. his chance to save hinami and die in the process.