The reason they tried to steal my card was probably to use it in future with rewritten information from freshly skimmed cards.

Beware of pickpockets who may shoulder surf you, steal your card and replace it without you noticing.

If the chips are of an opponent's, one can steal the card by equalling or bettering the number of chips already on that card.

A player's turn continues until he/she fails to steal a card.

When a new one was posted, they stole the card.