An Escrow refers to a bond, deed, or other document kept in the custody of a third party, taking effect only when a specified condition has been fulfilled.
In this case the song speaks of how as Christians we practice restraint whenever we face situations which in the world will call for more than just looking away but rather fighting physically.
This is not the direction which we as Christians are allowed to follow but rather turn the other cheek.

But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.

We however are reminded that our GOD is the GOD of vengeance and that HE will handle every issue that comes against us.

Say not thou, I will recompense evil; but wait on the Lord, and he shall save thee.

Just like JESUS was hurt and eventually crucified on the cross only to rise again and even to scare those who don’t believe in HIM the end, this is the same philosophy.

Behold, He is coming with the clouds, and every eye will see Him, even those who pierced Him; and all the tribes (nations) of the earth will mourn over Him [realizing their sin and guilt, and anticipating the coming wrath]. [a]So it is to be. Amen