What if Lewis Powell's gun had fired?

[RJNorton]

I have posted a few "what if" questions in the past, and I have another one for today. In Betty's outstanding book, she writes, "He (Lewis Powell) leveled the weapon at the astonished assistant secretary's head and pulled the trigger." Well, we all know the gun did not fire, and Frederick Seward was not shot in the head. My question is, "How would things have played out IF the gun HAD fired properly?" Would Powell have then gone into William Seward's bedroom, shot him in his bed, and then skedaddled out of the house? Would others have been shot, too? Also, if the gun had worked, would it have effected what happened over the next few days? Would Powell still have eventually gone to Mary's boardinghouse? Thoughts?