Salaah

Walking in front of the person performing Salaah

Q:

1. If a person walks directly in front of you, within a arms reach, in a masjid kabeer, should you restart the Salaah?

2. What about a small masjid?

3. Will the ruling change if the person was walking from in front, stepped directly onto your sajdah spot, walked towards you then pushed through touching your shoulders, but technically didn't cross in front from one side to the other?

Joining a masbooq in Salaah

Q: I am a follower of the Shaafi'i mazhab. In our musjid, which is mainly Shaafi'i the Somalian brothers will join a masbooq who has missed a few raka'ats and they will then follow the masbooq as if he is the Imaam.

1. Is this correct? If yes how should it be done.

2. What should you do if you are the masbooq and someone taps your shoulder or just joins your Salaah to follow you? Your input in this regard is greatly appreciated.