Since The World Insists...

After leaving the dentist with Esmeralda and Vincent, Seth didn't return to the base or the department store that was now only accessible from the second-floor window to avoid another horde amassing on the bottom floors.

Instead, he headed towards the southwest, first climbing the emergency escape of a tall building attached to the dentist from the road behind, avoiding the zombies roaming the ground.

"Okay, let's take a minute to prepare."

"No problem, Seth."

"Understood..." 

Esmeralda and Vincent stood around, looking over the edges and taking in the beautiful image of a city without people. 

'Celestia? Can I buy any skills to help Vincent remain more normal and take advantage of his new transformation?'

—I would suggest he switch from guns to using a strong melee weapon, as the evolution he gained was the seekers' burst of speed and balance.