One powerful, enormous angel appears from heaven with a tiny, opened scroll. His appearance and voice are terrifying. He has one foot on land and the other on the sea, yet John can reach out and take a book from him. Interesting perspective. This angel vowed before God, "There is no more time!"
Eating the scroll, or acting, replaced writing. The voice of seven thunders told him he would speak or prophesy, not read from notes he wrote.
This appears to be a buildup for the 7th trumpet. The end is drawing nearer.