We dont know amps previous few days of diet that led up to his friendly eating binge nor his activity v calorie ratio (previously) to accurately determine if in fact he would gain fat tissue. If for example, if he had been eating over MT the days previous, and one includes this food binge, it IS possible to gain fat tissue.
To say he would gain, maintain, or lose, is not "entirely" accurate without his history.
In the end of things, knowledge within diet and fitness can eliminate alot of unnecessary pain. And one should embark on a personal mission to earn it, if one cannot afford a dietician and/or trainer (or just dont want the expense).
I have to agree with Sara. If I deficit for 8 to 9 days, and eat over MT about 1500c (as an example), I can feel and even look leaner the next day. I dont compensate, but just return to the normal deficit. Fat gained: zero. The body can be much more "tolerant" (and the reasons are OBVIOUS) to a reasonable surplus when the healthy person had a trend of a deficit leading up to suddenly eating over MT.
I eat over MT at prescribed intervals regularly. I think its logical that if one deficits (and depriving energy) for certain lengths of periods, the body will make use of the "extra" energy that its been deprived--in a useful and efficient manner, and not for storage, IF the extra calories ingested are reasonable and short, and does not create a different history than what it has been used to. (It's creating the different history that can be the problem: for example, severely deficiting for a time, and then suddenly creating a history of over eating for another length of period, and then one could gain fat tissue rather quickly).
Best wishes to all on the forum,
Chillen