Rosencrantz and Guildenstern Are Dead Language and Communication Quotes

How we cite our quotes: Citations follow this format: (Act.Line). Every time a character talks counts as one line, even if what they say turns into a long monologue.

Quote #10

HORATIO: and let me speak to the yet unknowing world
how these things came about: so shall you hear
of carnal, bloody and unnatural acts,
of accidental judgments, casual slaughters,
of deaths put on by cunning and forced cause,
and, in this upshot, purposes mistook
fallen on the inventor's heads: all this can I
truly deliver. (3.349)

The play clearly calls into doubt Horatio's ability to tell this tale accurately. What obstacles are there to his being able to explain clearly what has happened? Are these specific to his situation or are many of them apparent whenever one tries to accurately recount a tragic event?