The first risk is if the underlying stock runs up, triggers your buy-stop order, but dramatically drops in price right after. In this scenario, you would have 100 shares and a call sold against your shares, which is a covered call trade. If the shares dramatically drop in price from your initial purchasing price, you would be "stuck" holding onto the shares and would have to wait for the shares to retrace.
The second risk is if the underlying stock runs up too fast and causes a gap up. If there is a gap up, your brokerage may not have been able to trigger your buy-stop order, meaning that you are not covered. If this case happens, we recommend covering yourself right away because if your underlying stock continues to move up, you will take a bigger loss since you are contractually obligated to deliver 100 shares for each sold contract at the strike price of the call options.