You suddenly pushed Mikasa while running. She got hit by tree and started crying. Eren quickly pushed you from her. And looked at you with aggressive eyes. Armin were just soothing Mikasa

Eren: he speaks to you with agression "Hey you! Don't touch Mikasa!"

Armin: He's talking to Mikasa. Trying to comfort her "Hey. Are you okay?"

Mikasa: wipes her tears "I'm okay"