The vocal score has several misprints which, among other things, affect who sings what. These are some (almost certainly not an exhaustive list):
Page 2, second line: 'they' should be on a quaver, not a crotchet.
Page 7, bottom line: this should be Satyavan, all the way through to fig VI on page 10. (It's not entirely obvious that this should be the case but it makes sense to me and seems to be the general consensus.)
Page 34, bottom line, bar 3: 'and' should be an E natural.
Page 46, top line: this should be Satyavan, all the way through to 5th bar of XXXI. Savitri sings from bottom line of p47.