So the rat bomb is a poetic way to finish this target off, so you can practically get in there, lay the bomb, and go about your business while he does the rest for you. Ehrlich is a German double agent intentionally giving bad intel, he is notoriously incompetent to the point of the Germans calling dibs on his equipment upon his inevitable demise, and he likes to shoot rodents on sight. If you pay attention to Karl’s dialogue with the resistance, what he reads from the mission intel you can collect, and even enemy dialogue, you’ll learn several things. It is literally an explosive, shaped like a rat.

The rat bomb is obtainable at the first starting point of the mission, where a resistance member will have one ready for you to pick up. He will shoot the bomb and do the rest of the work for you. Once you plant this bomb, simply get out of sight, and wait. The rat bomb is essentially a tool, like satchel charges or the crowbar, meaning it has a specific contextual action point where you can use it, and in the case of the target, Matthaus Ehrlich, there are several points like this in the storeroom he patrols, under the shelves.

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