Character A is not an expert, they want treasure, and their hope is that the runes reveal location of such. They have 40% chance of success, 60 chance of failure, failure producing something bad (that is possibly not causally connected to the rune examination.)
Character B is a rune expert, they want a way out, and their hope is that the runes show such. They have 80% chance of success, 20% chance of failure, failure producing something bad (that is possibly not causally connected to the rune examination.)
Meanwhile the character just see some runes, They know that one character is better at reading runes, but they do not know that it matters for what the runes are who reads them first. It is blindingly obviously to me that the players are not operating epistemologically even remotely in the same space than the characters.