1. Question: Why do we assume the husband is dead if he falls into a pit full of scorpions and snakes but if he was in a crowd where a whole bunch of snakes and scorpions were unleashed upon them the wife can’t testify that her husband died to get remarried?
A. The Shulchan Aruch (Even HaEzer 17:51) says that if snakes and scorpions were sent into a crowd and a wife said a snake or scorpion bit my husband and he died. She is not believed because perhaps she assumed her husband is like most people that die of a bite.
B. The Chelkas Mechokek (105) points out that this is only if the snakes or scorpions were sent amongst mostly people but if it is known that one of the people was bitten and his wife came and said my husband died of a bite she is believed.
Answer: If a person fell into a concentration of snakes and scorpions in a pit, we can assume that he could not avoid stepping on them and he was bitten but if a whole slew of snake and scorpions were sent into a crowd of people it’s possible the husband would not get bitten.