Early in the season (Blood and Sand), Spartacus agrees to fight for Batiatus with one goal in mind: earning enough coin to buy his wife, Sura, out of slavery. Batiatus promises to reunite them, using this hope as a carrot on a stick to ensure Spartacus performs well in the arena.
If we’re assigning guilt, . He deliberately poisoned Sura to sever Spartacus’s last link to humanity and hope of escape. Glaber saw Sura not as a person but as a tool—first as bait, then as a liability. His order to have her killed is the act of cold Roman pragmatism that directly sparks the gladiatorial revolt.
On the surface, . After being tricked by the Roman magistrate Gaius Claudius Glaber (who promised to reunite them in exchange for Spartacus’s service as a gladiator), Sura is secretly poisoned before being brought to Capua. Dying in agony, she begs Spartacus to end her suffering. He does—with his own blade. This moment is devastating: the hero as reluctant executioner of the one he fought to save.