What moment would cause the other four to come rescue their injured/heartsick brother? What affect would their wrath have on the so called friends of the one the come help?

Borrows one character from HP - but I don't think they'll miss him, and he dies pretty quickly. Xander's in trouble. A lot of trouble. He's out of immediate danger, but he still has a whole new life to get used to. (implied m/m ped. noncon)