It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is killed in a blind fight or in an exchange of missiles among them, with a stone, a whip or a stick, his blood money is the blood money for an accidental killing. Whoever is killed deliberately, his recompense is retaliation (qisas); and whoever stands in the way of this retaliation, upon him is the curse of Allah, the angels and all the people; no compensation and no ransom will be accepted from him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10802