Esteban has probably seen, or at least heard about, Trunks and ki usage before. Not even necessarily Trunks using it. Then again, they tended to be in different areas on missions so maybe not. He's no more than settled when Esteban moves, and Trunks frowns slightly. Watching the other stagger, before Trunks takes the expedient root of just sitting forward and dropping from the bars.

"I want you to be okay, before you do anything else. Seriously, take a longer break. Drink more water." There's a hint of stern-ness in the friendly tone, and more than a hint of sternness in Trunks' eyes.