Selene wasnt an enemy in that issue. The X-men and the HFC had a truce and were actually allies during this era. Selene, for what it was worth, was minding her own business, when Rachel attacked her in bed. It wouldnt have made sense for him to go in there and basically ignite a war with them by killing an innocent Selene. Its not like she was the aggressor who targeted Rachel. If that were the case, then yeah Wolverine should have attacked her instead, but thats not how it went down. There was no fight. Rachel was clearly aggressor there