Nafil Salaah in jamaat

Q: Qiyaam-ul-layl: I am a Hanafi  living in an area where, unfortunately, many do not follow a set mazhab. One of the brothers requested that 'Qiyaam-ul-layl' be performed in jamaat during Ramadaan. From his description, I understand this to be tahajjud salaah (as we have already
arranged for Taraweeh salaah). Is it permissible to perform any nafl salaah in jamaat?

Performing Salaah with a wound

Q:

  1. I had a scratch on my knee which I thought was almost healed. However, at the end of the day, I noticed many small spots (which I assume was discharge from the wound) on my pants and kurta around the knee area. I do not know when this occurred, but it is likely that some of the discharge occurred while performing sajdah. Do I have to repeat all salaah/tilaawat for that day?
  2. If one covers a wound with a bandage, and blood may or may not flow onto the bandage, would it be permissible to perform salaah in that condition, or does one have to be certain that the bleeding has stopped?
  3. Referring to (2), can one lead the salaah in that condition?

Superstitions

Q: Is it wrong for a wife to go home on Tuesdays and Satardays as we know the jins are spread everywhere in these days so there is a fear of possessing jins?