If the coin that I hold has the potential to increase from various reference sources, then I will also do the same as your friend. I will hold until the price of the coin rises again. However, 25% is an expectation which I think is too high.
if the price of a coin already pumped high and it looks like it's struggling to increase again, waiting for another 25% is indeed too high of an expectation.
the market could go down really deep or continue to go up again no one know but the chance of such market to go down again will always higher than it going up because people want to sell and make profit. but i also have seen some people that could make big profit by just holding a little longer so it's all really difficult decision to take.