This passage parallels several other parts of scripture that describe standing on a place as a sign of dominion over it. The mighty angel here may be the Holy Spirit, always pointing to another. God shows He has dominion over both Israel and the gentiles. Rather than delaying and focusing on the 7 thunders, God wants the contents of the scroll to be taught to those who haven't heard in the final days... this may mean a last-days revival for Jerusalem.