Here is the context:
Trevor: We've had a villa there for quite a few years. It has come in very handy during the summer holidays. I really look forward to going. I love the way the Spanish make a fuss of my kids. They all come over as such warm friendly people.
Stephen: Yes, it's true. The only problem for me is that I can't cope with the heat. Last time I went to Spain, it was so hot that I fainted. It took me quite a bit of time to come round. My wife was anxious. She said a bomb could have gone off, and I wouldn't have come to.
I just don't understand the sentence in bold text.