In Numenera, when a player rolls a 1, the GM gets a free intrusion (Core Rulebook, p.88)
The GM makes a free intrusion (see below) and doesn’t award experience points (XP) for it.
However, it does not state anything about paying experience to negate it, such is the case when the GM offers an intrusion.
So can I pay experience points to negate the intrusion caused by rolling a 1?
The reason I ask this is because in my group, I'm not sure if this is house-ruled or not, but it's the way the GM plays it, and always has: when a player rolls a natural 1, the GM gets a free intervention. The player can then choose to re-roll the one, but the intervention stands. If they roll another natural 1, the GM gets another intervention. I would like to clarify if this is house ruled, or if this follows the rule book.