Yeah, it's not until the exact moment Peter disappears below the edge that Qubit remembers he has no idea whether or not the kid has powers? He dashes toward the edge, but stops a few steps later when he spots Peter swinging along from his wristbands like it ain't no thing.

"... Oh, that's what those were," he muses aloud.

Welp, just means he'll have to leg it, himself.