As the whole party concentrates the assaults against the two remaining zombies, the undead monsters finally succumb... but it takes you a deal lot of effort to destroy them for good! You literally have to chop them down to pieces to make them stop fighting and moving. As the dust settles, the room falls silent for a few seconds, as the floor is scattered with assorted limbs and pounds of dead flesh.
[OoC: I've speed up things a little bit since this fight was probably getting boring to you all, technically one of the zombies would still be "alive" at this point, but I don't think it makes much difference.
Just OOC you might be interested in knowing that while these 5e zombies were very easy to hit, their special ability worked tremendously... when reduced to 0hp or less, they get a ST to "stay at 1hp" and so many times they made this save. It's a bit hard to describe this ability, since with zombies it's not that easy to think of HP damage in terms other than physical damage (they don't get tired or demoralized), so when taking damage esp. from slashing weapons it's automatic for me to just say they get injured. Then they make their ST and keep fighting...]