Actually venting problems with the person may help them understand that you dont like or wont tolerate his or her behavior and can help understand not to do it in the future with other peers. It's never good to be shy and scared please speak up.
ANSWER
Two different species of mice migrated to the river from different directions.
EXPLANATION
Solved scientifically in my head.
In the binary (good vs. evil) epic world of Beowulf, the king is a defender of law and order, and Grendel is the villain who challenges these principles. But neither the king nor Grendel act on their own. The king is God's representative on Earth and a protector of all his subjects. On the other hand, Grendel is not an ordinary villain or a monster. He is the descendant of Cain, Biblical figure who killed his own brother. As a creature of hell, he mustn't touch the king's throne, which is God's endowment. In other words, the one who symbolizes the Devil must stay away from God's symbols.