Readied actions are both powerful and limited. The power comes from them always going off first, the weakness is you have to be exact in your wording.
The last session I played we worked out that the enemy were set up behind a door waiting for us, and that they had a spell caster. I summoned a bear and told it to attack the nearest unarmed opponent (hoping that the spell caster would be not wielding a spell caster (We knew it was a very high int caster). The bear walked in, and proceeded to rend to pieces the nearest prisoner chained to the wall.
I didnt complain, I gave the bear instructions and it followed them, It was just unfortunate there were prisoners in the room we didnt know about.
This situation is exactly similar, the guy misworded his ready, he loses his action. Next time he will word it properly. The DM made the right call, and while it seems harsh It works both ways, If you suspect that NPC's are waiting for you, then they probably have readied actions like "attack the first thing that comes through the door", at this point you can break up their readied actions farily easily with summon monsters and the such.
Just my 2c
And it seems like the player accepted this, which is even better
Majere
The last session I played we worked out that the enemy were set up behind a door waiting for us, and that they had a spell caster. I summoned a bear and told it to attack the nearest unarmed opponent (hoping that the spell caster would be not wielding a spell caster (We knew it was a very high int caster). The bear walked in, and proceeded to rend to pieces the nearest prisoner chained to the wall.
I didnt complain, I gave the bear instructions and it followed them, It was just unfortunate there were prisoners in the room we didnt know about.
This situation is exactly similar, the guy misworded his ready, he loses his action. Next time he will word it properly. The DM made the right call, and while it seems harsh It works both ways, If you suspect that NPC's are waiting for you, then they probably have readied actions like "attack the first thing that comes through the door", at this point you can break up their readied actions farily easily with summon monsters and the such.
Just my 2c
And it seems like the player accepted this, which is even better

Majere