Passing wind

Q: I have heard that passing wind being in the state of wudhu, breaks wudhu only if the wind has odour or sound. Otherwise wudhu remains valid. Is it true?

Moving back in Salaah

Q: Two people are praying, with the muqtadi praying to the right of the imam. A third person then joins and pulls the muqtadi back to stand with him in a row behind the imam. When the muqtadi is pulled back, he ends up taking more than three steps due to the surprise factor (he takes about four small steps). Will this break his salaah?