Inspired by this question:

[substitute "6 hours" in this question with whatever one's tradition might be]

Suppose it is less than 6 hours since Reuven last ate meat. Out of habit, he mistakenly bites into a dairy candy bar. While it's still in his mouth - but before he swallows it - his kind friend Shimon reminds Reuven that he's fleishig.

Now Reuven is in a dilemma: Does he spit out the candy bar or swallow it?

I would expect an answer treat the type of food as an example, and treat all cases (e.g. what if it was milk, etc.)

So what should Reuven do?

Inspired by this question:

[substitute "6 hours" in this question with whatever one's tradition might be]

Suppose it is less than 6 hours since Reuven last ate meat. Out of habit, he mistakenly bites into a dairy candy bar. While it's still in his mouth - but before he swallows it - his kind friend Shimon reminds Reuven that he's fleishig.

Now Reuven is in a dilemma: Does he spit out the candy bar or swallow it?

I would expect an answer treat the type of food as an example, and treat all cases (e.g. what if it was milk, etc.)

So what should Reuven do?