The reason their first visit to Salisbury was so brief

The reason their first visit to Salisbury was so brief was because they had been forced to cut it short due to snow. They then decided to return the next day.

The two men surfaced a day after

One mechanism our cells share is fluctuating levels of calcium ions, which carry an electrical charge. In humans, this charge assists in controlling when your neurons fire messages. Changes in calcium ions make your heart beat or your muscles contract so you can get up and leave when something threatens you.