"Wait what?, Don't tell me you're going to fight all those Werewolves? Just look at them, there's like four of them. We need to run, Ethan!" Kirk shouted in disbelief and a lot of fear, not just for himself but for everyone that was gathered around him.
"Yes Ethan, I agree with Kirk. We can't win this fight, bro. We'll all be killed within seconds. Let's go, now!" Joseph also added his piece in support of Kirk's plan to escape which to him, as far as he was concerned was the best plan for their situation. He knew Ethan was powerful, so powerful that he had been able to somehow escape all these scary beasts in the house, but escape was different from fighting.
Ethan may survive a couple of exchanges with these creatures, but even then, the boy was guaranteed to fall at some point. How much more him (Joseph) and the other normal humans with Ethan. For them to survive with their lives, escape was inevitable.