No shipping business here folks, keep your gonadcanons under control.
This is mostly a crack theory because Surges and how they manifest in different realms are murky topics, but 'Spiritual Adhesion', this WoB, and the note on Lightweaving in WoR Ars Arcanum have convinced me that Szeth's screams and Shallan's fractured psyche are the results of their reckless use of Adhesion and Illumination respectively.