Keep the rifle muzzle pointed in a safe direction and count backward for 25 before you move. Some times there can be a real long delay in a hang fire. Especially if the powder got damp and is in the barrel smoldering. Once you have counted backward from 25, put another primer on the back end and let it go again. If it still fails to go off, you have a couple options...

You can pick the 209 breech plug with a nipple pick and then try another 209 primer. Sometimes that is enough to make them fire. If it still does not fire, then you need to pull the breech plug and push all the powder and projectile out the back of the rifle. Then swab the barrel with a damp patch paying special attention to breech plug threads. Get them clean. Swab the barrel clean and then run some dry patches through the barrel to make sure the barrel is bone dry. Clean the breech plug. If the rifle failed to fire you will find it packed with wet or damp powder. After you have the fire channel clean, re-grease the plug and put it back in. Thenpop two of the 209 primers through the breech plug. Now reload the rifle like normal.

If the rifle fails to fire again, check your powder.. something drastic is wrong !!