Not the first!

[Telchar]

This is maybe a little farfetched, but this passage had offen left me en some kind of doubt...

'...and if I must break the them, I shall break my heart, and I shall be slain; first of all the Eldar in aman'
'Not the first' said Mandos

The obvious thought is that Mandos is foretelling the slaying of Finwë, but could he be talking about Miriel? - wouldn't you consider her 'slain' as well? The very first time I read the SILM my instant thought was Miriel - because I hadn't read the rest of the page... still???