Henna, it depends how quickly the market is falling (if you're long or rising if you're short). This is always an issue when the market moves with speed. My advice is use the matrix to determine the underlying price at which your warrant is stopped out. Then set an SMS alert on the underlying for this level, but maybe give youself a little bit of breathing room so you get the SMS a little before the stop level is hit.
Point is sometimes the market means you miss your stop, but you still need to exit when it's hit.