When Laura is competing in a triathelon, during the bicycle portion of the event, she is accosted by two men on bikes. To escape, she jabs her bicycle's air pump in the spokes of one of the men's bicycle wheels, losing it in the process but when she finishes the bicycle portion, the pump is back on the bicycle.
Kendall spends some time at the registration table "secretly" swapping Laura's number for her own. But the paperwork is on the same table the registrar is standing at and Kendall would have been doing this right under her nose. Laura was only two people back and looking towards registration. Neither the registrar nor Laura notice her very conspicuous behavior.