Sketch of the CSM geometry around SN2015bh at selected epochs. Panel a: pre-explosion extended CSM derived in this paper; panel b: expansion of the ejected shell into the extended CSM assuming the shell is ejected at t ≃ −40 days, hence the radius of the shell R_shell = R_⋆ at this stage; panel c: post-explosion scenario where the star survived; and panel d: post-explosion scenario for a supernova explosion.