Bhava can be translated as trance.  Samadhi is a spiritually advanced state of consciousness in which one is so absorbed in inner consciousness as to lose all awareness of the body and time.  Bhava samadhi is when a higher spirit or astral body enters the body and places a person in trance. The depth of the trance may vary, but it is quite possible to lose body consciousness and experience samadhi.  People in trance may dance ecstatically or move around seemingly erratically. It depends upon the spirit in them. What is common to all bhava samadhi is the feeling of spiritual bliss.