Why does Krishna say that the Kauravs are already dead?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

दंष्ट्राकरालानि च ते मुखानि दृष्ट्वैव कालानलसन्निभानि ।

दिशो न जाने न लभे च शर्म प्रसीद देवेश जगन्निवास ।। 11.25 ।।

danṣhṭrā-karālāni cha te mukhāni…