Rule 3 & Exception 7

RGEO/60-61

The initial syllable usually retained some degree of stress. In long words, especially recognized compounds, it was, though lower in tone, often equal in force to the main stress: as in óromárdi, fálmalínnar, etc. It was weaker when immediately preceding the main stress, as in Àndū́ne, ṑmáryo, Tìntálle, Rṑméllo; and in such cases, if it was short it became unstressed, as in avā́niër.