Abruptly, there was a strong grip on my arm and I was hauled coughing into an upright position. At about the same time I was working out there were no wounds in my chest, someone wiped a towel roughly across my face and I could see. I decided to save that pleasure for later and concentrated on getting the contents of the tank out of my nose and throat. For about half a minute I stayed sitting, head down, coughing out the gel and trying to work out why everything weighed so much.