Answered by Shaykh Faraz Rabbani
Can you break your prayer if you have not started saying the Fatiha yet?
Answer:
Assalamu alaikum wa rahmatullah,
In general, once you begin an act of worship you have the duty to complete it; and only a strong reasons (such as fear of harm, for oneself or others) allow breaking the prayer. (Shurunbulali, Maraqi al-Falah)
Jazakum Allah khayr.
And Allah alone gives success.
