Attacking a Demon Prince with nothing but a melta bomb. Its a suicidal run. It might not even succeed. The damn-it-all heroism and desperation on display is breath-taking. Even if he should succeed no-one will know, for he seems to be alone against the damned thing. Not entirely true, the Emperor will know...

.. that break in the darkness of the clouds. Symbolic. Something tells me, he will actually succeed.