For most of the series, Shinichiro was a saint. Here, we see the collateral damage his "kindness" caused by leaving Izana behind.
Should I focus on how this chapter sets up the ?
Izana views the Sano bloodline as a throne he was evicted from. His violence is a tantrum against a fate he canтАЩt change.
Notice the "dead" look in MikeyтАЩs eyes compared to the frantic, wide-eyed gaze of Izana. It marks the difference between someone who has lost everything and someone who is terrified of never having had anything at all.