I seriously doubt it's suicide. I wouldn't be too surprised if Umbridge was behind it. She's just too mean spirited to be trusted BY EITHER SIDE! She'd swear loyalty Vulturesnot then turn right around and stab him in the back for her own reasons. She'd do the same to Bumbleohsomore without any regrets. Now the meeting between Xender, Remus and Hagrid would be something to enjoy with a large bucket of popcorn.