Final answer:
Jace should use an informal tone and personal dialogue, avoiding overly academic vocabulary when changing the communication channel from formal to informal to discuss his class presentation with his friend Ryker, making the conversation engaging and relatable.
Step-by-step explanation:
When Jace is changing the communication channel from formal to informal to tell his friend Ryker about the presentation he gave in class, he should bear in mind the expectations and the culture of his audience, which in this case is his friend. In a less formal setting, Jace is likely to use an informal tone, incorporating slang or shared references that both he and Ryker would understand. He would not necessarily need to use the same academic vocabulary that he used in his class presentation because that may not align with the expectations of his friend who is not part of that classroom context.
The key when transitioning to an informal channel is to ensure that the dialogue is relatable and comfortable for the audience. Therefore, rather than giving Ryker his research paper to read or using overly formal language, Jace should aim to convey his message in a way that is engaging, personal, and fitting within their usual manner of speaking. This caters to Ryker's time constraints and maintains the casual nature of their friendship.