Spider turning into a crab

I was in a huge mansion that was gorgeously decorated and I was in an upper room, lavishly furnished with incredible art work. I was admiring a statue when I suddenly heard high pitched excited talking, shouting and even screams from men and women. I run downstairs and find a bunch of people that I know in this kitchen area that has a complete brick floor and a section of the
kitchen is a greenhouse.

The greenhouse area is where everyone (some are from my current church and some are from other churches in my past) is standing and excitedly talking. I look beyond the people and I see a large spiders web, but
instead of the thread being fine, it looks as thick as  jute string. There is a large
black spider with red eyes in the web. It is about the size of a large serving platter, including the legs.

The people are shaking the web, and I tell them, "stop, you don't know what this will do, leave it alone!" They continue shaking the web and the spider falls down a few "rungs" and catches itself by its
legs on the web. This continues another 4 times and then the spider lands on
the floor. Once

it hits the floor, it scuttles sideways and doesn't run forward, but sideways like a crab. Everyone screams and jumps back and I yell "We
must kill it!". No one moves. It runs sideways trying to get away and hide. I have
one flip flop on my left foot, my right foot is bare and an asbestos type
cooking glove is on my right hand. I tear off the glove and throw it on the spider and
then jump on the spider with my right bare foot and kill it immediately. Blood and guts squirt everywhere.

I pull the glove off of it and suddenly the spider is actually a huge black crab that is the size of a barrel. It is definately dead. Everyone else is grossed out and still screaming. I look at the crab and realize
that there is nothing inside. It is only an empty shell. There are no messy
guts or
insides. I  wake up...