But if you are in danger, then (say your prayers) on foot or on horseback; and when you are secure, then remember Allah, as. He has taught you what you did not know.

And his people disputed with him. He said: Do you dispute with me respecting Allah? And He has guided me indeed; and I do not fear in any way those that you set up with Him, unless my Lord pleases; my Lord comprehends all things in His knowledge; will you not then mind?

We know best what they say, and you are not one to compel them; therefore remind him by means of the Quran who fears My threat.