1)
What is the meaning of "Pachadu Ish El Re'ehu"?
1.
Malbim: Each feared about his colleague, lest one of them tell the king, and he will be angry at [the others] for not telling him. Therefore, they decided to tell him.
2)
Why will they tell the king?
1.
Rashi: Perhaps he will hearken.
2.
Malbim: Refer to 33:16:1:1.