You and Armin both fall to the ground, this isn't what he expected, but he also feels sorry for you.

"Your feet are bleeding... it looks like you won't be able to walk." Armin wraps your feet with a cloth he found there.

"I'm happy to finally find one survivor, at least I'm not alone. I'm Armin." He says that while wanting to get to know you, well this is a critical situation but what's wrong with getting to know each other right?

"You...Nia Ackerman, right?" Asked Armin while helping you up and walking with you towards the broken house, at least to take shelter from the Titans, you and he could see lots of Titans. And on average the Titans almost killed all the cadets, maybe only you and Armin managed to survive.