I think he is still unaware what shit he is in, and what he found out about Yuno is just scary, to us viewers it's just less scary, but to him as being her passionate target, it's like eating Onigiri's and knowing one of them has a needle.
This situation can be scary for him, and he will likely try a non-violent solutions only to find out it's not going to work.
That is why he is even more scared of Yuno, because she has no qualms about killing.