Watch the Ending Licks online guitar lesson by Jasper Mortier from 50 Blues Bass Licks You Must Know
As a bonus I just want to show you some standard blues endings. Let's look at a medium tempo shuffle in E coming from the V. There's a millions of variations as you can imagine. First is: to stop or not stop on the IV. In a jam situation often the front person (singer or soloist) will cue this. Otherwise take initiative together with the drummer. A great advantage of the stop is: it's undeniable, so pretty safe in a jam situation. The stop can be left empty or be filled by drums/vocal or lead instrument.