On lines 155-164. What did Mr.Hooper do when his veil swung forward while prayong with the corpse? What did an observer say happened then?

"A person who watched the interview between the dead and living, scrupled not to affirm, that, at the instant when the clergyman's features were disclosed, the corpse had slightly shuddered, rustling the shroud and muslin cap, though the countenance retained the composure of death."