Hi guys, I played against a friend who used Senor Massacre and came across a brutal move : he first used "kiss my sexy ass" so I couldnt hit anybody but Massacre so I thought I might as well kill Massacre and I reduced him to 1 hit point with one attack, I hit him again with another attack for 5 damages but then he used Epic Regeneration and was back to full health !! thats why I want to make sure we played this Tactic as intended, card says "after Massacre receives damage but before sending him to the infirmary" which confused us a little...
Just as you did, when you hit Sr. Massacre and deal enough damage to send him to the Infirmary, after you put that damage on his card, but before sending him (because it has enough damage dealt to go there), your oponent can play "Epic regeneration",heal all the damage of Sr. Massacre and "it happens nothing". :3