My hero husband

My hero husband is injured. Knowing him as a absolute peace lover, certainly, there is no need to set the background as war.
Yesterday, when I back home from outside, he came to the edge of the stairs to welcome. He always does so, and it makes me always believe that he misses me terribly, after a whole day without valuable enough communication with me. But this time, he came with a hand held up, and its thumb wrapped in a messy bunch of handkerchief.
'Oh my god!' I said, 'you got yourself cut.'
He admitted immediately without even a little bit self-defending attempt.
'Sorry,' he said, 'I didn't expect that the new knife is really so sharp.'
I believe that my eyesight was not so enjoyable by then, because I could imagine how painful it could be when the injury happened to fingers.
He was cutting onion when he got himself cut, while he intended to prepare my favorite dish -- sauerkraut pizza.
'It is only a knife for cutting tomatoes,' I said.
'Yes,' he replied immediately, 'we need to find a knife for cutting onions.'
What can I say? He certainly knows that I didn't mean that he should cut himself with an onion-knife instead of a tomato-knife.
Nevertheless, the pizza is really tasty, as always.