When Eclaire kills you, she's not killing you. She's passing judgement upon you and bringing you to the afterlife before you can sin further~
And the beam is a piercing one. The energy dispersal is actually minimal, which is why, against large forces, she would angle it as much as she could, so it could cover as much ground as possible and make a path. Think of it as Meltdowner's lasers. Except less spammable (until, you know, she levels up). Collateral damage mode would actually ruin the whole concept of it being a 'spear'.
And the beam is a piercing one. The energy dispersal is actually minimal, which is why, against large forces, she would angle it as much as she could, so it could cover as much ground as possible and make a path. Think of it as Meltdowner's lasers. Except less spammable (until, you know, she levels up). Collateral damage mode would actually ruin the whole concept of it being a 'spear'.