Roman general

This may have been a combination of two dreams, its a bit hard to tell. A group of friends and I were visiting another friend, looking at a house that the friend had just moved into. Someone removed this strange plant, a cross between a vine and an aloe plant which caused the friend we were visiting to become anxious. In the process of removing said plant, pieces came off. I picked up a piece knowing that we could grow the plant again. I tried to calm the friend down, telling him this, but it didnt seem to help. The next time I saw him (we hadn't left), someone had handed him a decorative blade (curved edging, lightweight, and a piece that extended further than the blade tip). He had told us not too and was now staring at it and then licked it with a dark possessive look that left me feeling cold. I didn't think about it again until it was going dark and while I couldn't here screaming I could feel thick tension. One of the girls from the group was hiding in a closet when I found her, she kept saying that the friend was crazy, that he was after us and that I should run. So I moved deeper into the closet, leaving the girl there. There was a press board door at the back that I bumped into that exited to the garage. By the time I found it, the girl was screaming and I knew he had found her. I ran to the neighboring yard and found a couple others I had showed up with. A short distance from the house I could see lights reflecting off a lake. I listened to my friends saying that the friend was crazy, that he was evil, or possesed. One looked at me, he looked beat up on, and told me that he was coming for me. I was confused by this. So we ran. We dissappeared under the lake into a house that steadily was loosing oxygen. I don't know why. I just remember breathing shallowly. Everyone feared to leave, knowing that surfacing would put us at risk. But I knew I couldn't just keep running and that if I stayed the others may have a chance. I don't think I got too far myself as I kept seeming to fall asleep (and I could watch that), and not really go anywhere. It got quiet and I know I was being left behind. I felt someone next to me as I was moved.