-you killed
The word matarais is the imperfect subjunctive form of matar in the second person plural.
See the full matar conjugation


Hacer que os matarais el uno al otro no solo era eficiente.
Having the two of you take each other out wasn't just efficient.
Dije que las matarais, ¿a qué estáis esperando?
He promised not to hurt us, remember?
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