She didn't quite expect that and gravity did the rest, pulling the two bounty hunters to the ground from the tackling motion. The result was an awkward landing and angry, desperate squirming.

In said squirming, Samus managed to knee the side of the car. It suddenly and abruptly wailed in reply with a car alarm.

To which caused Samus to cease in her struggle. The alarm going off was abrupt and jarring enough from whatever exchange of anger and amusement was resulting from their stupid competition to set her into a small laugh. Slowly, and quietly to herself and probably couldn't be immediately heard over the alarm, but, yes, that was pretty funny.