i do have a question.... what should a sub do when he/or she has been left in subspace after a scene and the Dom has literaly left the vacinity and left the sub there what are the dangers of this and what should a submissive to in this situation?

i was in a scene with my Master and it was a very intense scene and after words i was very deeply into subspace He unbound me then left me be no words besides i am tired i am going home then left me there in subspace i did experience a harsh subdrop at this and am very confused as to why He would do this to me and i need to know what i should do besides talk to Master about it what should i do if He isnt responsive to it or if He does it again. what can i do to bring myself down from subspace if it should happen and what are the dangers most importantly of being left alone in subspace?