"Did the strap just change?" You know, like all straps just do on a person's body: expand as necessary without manual adjustments made. Which, if the SCA did that- "That's what the bands do too. They change shape! Unless... you think it'd still fall off?"

He looks at his own arms band, the back at Taiki. He does want to show that it can change shape, but he should see what he thinks first!