Looking at the whole riddle, I'm wondering about the not-so-Silent Watchers at Cirith Ungol.
Dripping blood, maybe - I wouldn't be surprised if this were part of their description; also given the massacre in the Tower they were metaphorically dripping with blood.
In inertia, but not silent. - They were stationary ('in inertia'), but despite their name, I believe shriek either when Sam enters or Frodo and Sam leave.
Sentinels, possibly - This is a synonym for 'watchers'. At first sight, it's not clear whether the pair of statues are guards or not.
Of a place both foul and violent. - If this doesn't describe an Orc tower on the borders of Mordor, I don't know what does!
hS
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