One Punch Man Manga Chapter 135

A flashback reveals Drive Knight siphoning energy from an underground power cable to reach the battle between Tatsumaki and the Psykos–Orochi fusion, inadvertently causing a massive blackout.

In the present, Sweet Mask, shaken by his earlier helplessness, spirals into a dark resolve to kill everyone to preserve his flawless hero image. Iaian questions him, triggering a memory of Blast once saving and inspiring him, which snaps him back to sanity. Regaining composure, Sweet Mask deflects the moment by blaming his disturbing thoughts on his outfit.