Amud 111a

He should open with ‘Ail’ - נפתח באל

Summary:
For the נפתח, etc. we can either say פסוקים (according to the רשב"ם), or recite a prayer (ר"ח)

If it is the beginning of her period, she will kill - אם תחלת נדה היא הורגת

Summary:
The concern of being killed by a נדה, is only if she performs sorcery with the intent to kill.