Assessing how well a person can understand and communicate in English is the first step in identifying the need for an interpreter. Engaging an interpreter is recommended when the client: Requests it. Speaks English as a second language and is in a stressful, complex or unfamiliar situation.
It can show you what the speaker is doing and thus you will know why they are doing it. once you know this you will know what to expect in a speech and thus the speech does not work on you as effectively.
