Could go either way

Idk Man

It's a Scythe vs a old man

Freddy Krueger wins.

Manish intends to kill Tooru.

Calamity appears and kills the baby

But if he dosent have wou in the dream world he looses

The moment manish boy intends to attack toorus dream he gets attacked by WOU, that counts as pursuing

Well, Kakyoin could use his stand in Death 13's world since he got knocked out while Hierophant Green was summoned. If we're considering WoU is in Death 13's dream world then I'll go with WoU.

If it's just Tooru, then Death 13 because stand abilities don't seem activate at all if it's just the user trapped.