I understand that one is supposed to follow along with the communal Torah reading in Hebrew. But is this actually a requirement, as opposed to just a good thing to do? Another way of asking the same ...
The Mishnah in Megillah (2:2) says that one who reads the megillah while semi-asleep ('מתנמנם') is yotzei. The gemara comments (18b): מתנמנם יצא וכו': היכי דמי מתנמנם אמר רב אשי נים ולא נים תיר ...
Suppose the one who is leining (reading) the Megillah needs to stop in the middle of leining, and is unable to continue. Is someone who was there the entire time allowed to take over?