An example of the Báb’s impact on some who were present during His brief public address at Vakil Mosque: - Mírzá Rahím-i-Khabbaz

Among them also was Mírzá Rahím-i-Khabbaz, who distinguished himself by his fearlessness and fiery ardour. He relaxed not in his efforts until the hour of his death. 

(Chapter 8, ‘The Dawn-Breakers’)