The Searing Flash ability used by The Second should be a column attack, but it can rotate with the boss and hit you even if you move to the side of it. The only sure way to avoid it is to outrange it or be at least 90 degrees or more from the telecast lines.
Of course, this isn’t really a Dark Agartha bug, it’s a problem elsewhere in the game. Just like the other such report I made.
The most frustrating part is that not all column attacks are bugged in this way. The Onryo boss (forget the name) in Dark Agartha has a column that doesn’t move. It hits where it says it will.