2 Verbs to Use for the Word seethings

He, too, felt a seething in his blood, the nip of life in every one of his pores!

Unseen forces and currents, tides and pressures, set up a seething and flowing, pulling and twisting of the drop of ink until it becomes a strange wraith created out of the molecules.

2 Verbs to Use for the Word  seethings