Smack pack flub, am I outta luck?

I brewed a 5 gallon batch last night, and it was the second time I’ve used liquid yeast. The first time, I had no issues at all.

This time, I smacked it, felt it pop, and thought I was good. The pack was expanding at about the same rate as last time. Overall, it was about 4.5 hours from the time I smacked the yeast to the time I was ready to pitch.

When I opened the yeast to pitch, I discovered that only one of the two inner packs had actually popped. I used sanitized scissors to open the other pack, pinched the top of the pack and shook to mix it up prior to pitching, but I wanted to know if I have any chance of ending up with beer, or do I just have 5 gallons of wort that won’t ferment?

Do I need to adjust and let it ferment longer (or stay in primary longer)? Am I only going to get half the yeast to work with no solution? Or, should I just pour it out today, have an easier time cleaning out my carboy, be able to brew again sooner, and consider it a lesson learned?

FWIW, the yeast in question was Wyeast 1318 London Ale III.

Leave it alone. The inner pack is just to activate or proof the yeast. Most of the time I don’t even smack it.
I would let it ferment as you normally do.

Awesome, thanks for the reply.