Vulnerable - Street Photography portrait

I took this shot while out shooting some street Photography a few years ago. Something about the whole scene grabbed me and so i snapped this shot, once I had taken the photo I walked on, but as I walked past the man I realised he was having trouble so I went up and spoke to him, he asked whether I could escort him across the road as he was nervous about crossing alone, which I did. The shot gives me mixed feelings when looking at it as I know what is going through his head when I am taking this and the look on his face is one of fear and confusion. I hope you like the image, let me know your thoughts:

Image copyright property of Nicholas Adams (www.nicholas-adams.co.uk)