If possible, bring an ally that has a skill that caused Bleeding or a similar effect.
Use skills that are defensive and/or supportive.
Disables like stun, restriction, chaos, barrier, etc, will help a lot.
Tokugawa Bishi: "Come on! We must hurry! Let's move out and deliver the weapons to the front line on time, there is not enough weapon over there. But be careful, the enemy might attack us on the way. I must go back to do analysis after this."
Before battling Genan
Vadar (with mask): "See what we got in here! Ninja from Fire Village. Genan, go and destroy them. I have to save my power to fight Yudai."
Genan: "Yes, master! Puppet Shin & Puppet Ryu!"
Unnamed Black Ops unit: "You finally arrived! I was worry if we can defense for any longer!"
The failing quotes only apply if the player loses against the battle with Genan.
Tokugawa Bishi: "We are too late! We fail to deliver the weapon on time."
There are a few errors in the quotes. The first one, with Tokugawa, she said "weapon" instead of "weapons" at the end of the second sentence. The other text error is when the Black Op ninja says "defense," it was suppose to be "defend."