You rogue, do you dare beat an innocent cow because Lord Kṛṣṇa and Arjuna, the carrier of the Gāṇḍīva bow, are out of sight? Since you are beating the innocent in a secluded place, you are considered a culprit and therefore deserve to be killed

yas tvaṁ kṛṣṇe gate dūraṁ
saha-gāṇḍīva-dhanvanā
śocyo 'sy aśocyān rahasi
praharan vadham arhasi

Meaning :

You rogue, do you dare beat an innocent cow because Lord Kṛṣṇa and Arjuna, the carrier of the Gāṇḍīva bow, are out of sight? Since you are beating the innocent in a secluded place, you are considered a culprit and therefore deserve to be killed