User blog comment:Xilinoc/Ch. 563 - SUPERSTAR NEVER DIE/@comment-1706259-20131227165911/@comment-5398287-20131231013912

Er, I don't think Kubo is "Kubo" enough, nor is Yhwach even powerful enough, to kill an immortal character off-screen. The explosion was likely just Yhwach being a tosser as usual.