Only the feudal lord left

The change was peculiar, yet no matter how much Tom looked, he couldn't spot the ongoing process. 

'I'm sure it's thinner than it was before,' he thought, squinting his eyes. 'I can already see his muscles pretty well,' he added, not sure what to think about the situation. 

The one thing was obvious. The man's arm continued to thin out as if he was consuming the fat in his arm for every second of the arm-wrestling match. 

'Is he using it for fuel?' Tom thought, puzzled by the situation. 'I might not be a biologist or a medic, but that shouldn't be possible, would it?' he thought, confused by the situation. 

'Well, at least now I know why they were so confident about winning the match,' Tom thought, closing his eyes in order to focus even more strength in his hand.