We can see lightning far away at night but can't hear thunder. Do we have to stop?

Not necessarily. The NFHS lightning guidelines (October 2024) note that at night, under certain atmospheric conditions, you can see lightning flashes from distant storms.

If no thunder can be heard and the flashes are low on the horizon, the storm may not pose a threat and it may be safe to continue.

Independently verified lightning detection information helps remove the uncertainty. If it shows a strike within 10 miles, or the sky looks threatening, suspend play.