The answer is: alliteration.
Alliteration is the occurrence of the same sound or letter at the beginning of contiguous or closely connected words.
In the example lines, each of them contain alliteration. For example:
Line 1264: marked, murdered, moved.
Line 1268: with, watcher, waiting.
Line 1269: wrenched, wrestled.
Line 1274: brought, hell-brute, broken, bowed.
Line 1288: hall, hard-honed.