Ryan wished that he had a plan against even one of those two, but he didn't have it. He decided to fight them because they certainly were the most troublesome foes and because the rest of the group would be able to fight more accessible if they didn't have to worry about them. Regardless, Ryan was in the wrong spot, and the situation will only get worse, so he had to damage them as fast as possible before they could have the chance to do something even more dangerous.