Final answer:
The literary device portrayed in the given excerpt is onomatopoeia when Sebastian and Antonio describe the noise in 2.1.302-308.
Step-by-step explanation:
In the given excerpt, the literary device portrayed when Sebastian and Antonio describe the noise in 2.1.302-308 is onomatopoeia. Onomatopoeia is a literary device in which words imitate or suggest the sounds they describe. It is used to create a vivid sensory experience for the reader by incorporating sound effects into the writing. In this case, the cracking and ripping sound is described using words that mimic the noise itself, such as 'cracking' and 'ripping'.