The very first photo I took (the one below) was actually good enough for me to pack it in, but I stayed for a few more shots. After five or six more photos of black sky, I decided to pack it in.
This type of lightning bolt is a positive bolt, more commonly known as Anvil lightning. These can typically strike anywhere within a several mile radius, where I was only two miles away from the cell. Brandishing a metal tripod and a spot under a tree, not to mention standing in a puddle of water, I decided to go ahead and pack it in on the account I felt uncomfortably unsafe.