[quote=Rilla]
That can go both ways. with people having "strange, specific. weaknesses" that make it literally impossible for the.other person to take advantage of. Same with weaknesses that are completely at the mercy of the.controlling player.
[/quote]

It was hypothetical.

For a more relatable thing:

Lets say this man is very durable to most elements without fire. His opponent who doesn't know this IC but does OOC, uses fire first thing for no reason. He's not a pyromaniac, he's not a fire Mage, whatever.

When it IS a fire Mage, however, then it's different because fire is their strong point so of course they'd use it.

But when you have a very varied character with lots of different abilities and by coincidence you use a fire bomb on your opponent who is weak to fire without any indication, it's fishy.

Unless the character has super perception. Or something.