The line:
“Felt in the blood, and felt along the heart”
shows consonance, which is the repetition of consonant sounds, particularly at the end or middle of words.
In this line:
The "l" and "t" sounds are repeated: felt, blood, felt*, heart*.
These repeated hard consonant sounds add a rhythmic, almost echoing quality, emphasizing the deep physical and emotional feeling.
It’s not alliteration (repetition at the beginning of words), and it’s not enjambment because the line ends with a punctuation mark. The focus is clearly on internal consonant sound repetition, making consonance the right choice.