That's weird cause I was chasing Cath and her pal since they ignored me and went for the side room in the corridor left to the boss throne room because I was stepping on EVERY chest of the main hall.
Turned out I killed everything except the boss before I caught up with them two thiefs (including the two stairs' reinforcements) and once I did catch up to them, they had already looted the Magic user promotion item and that pegasus/wyvern one too (IIRC), but I was perfectly able to steal back with Astohl /Astol / Astorre / whatever his real name is...
That was nice cause I expected them two to flee by stepping outside of the map... And Roy didn't talk to her yet. Welp, after I had him talk to her, she wouldn't disappear either. And her thief pal wouldn't move an inch either (I killed him in the end after stealing his lockpicks).
Dunno if my game is broken or something.
I got some weirdass bug on chap 10A with Gonzaless when his Devil Axe was backfiring vs a reinforcement pirate at the bottom of the map (next to the two forts) and he took 30 damage from himself, then the enemy pirate counter attacks and connects, but at that point it's the enemy pirate's HP digits that start to scroll and cycle ad infinitum with weird symbols while the rest of the screen is hanging lol.
Maybe both "bugs" have to do with the "new" 2013 1.0 patch from the sticky post ...
EDIT:
Well, of course you CANNOT steal weapons (equipped or not), only items (vulneraries, lockpicks, orbs/gems, stat boosters and promotion items)...
Only issue on that map is if / when you DO let Cath & her pal come and grab the main hall chests. Thankfully I was kinda rushing in since my team was pretty strong already... Dieck + Rutger + Lance were able to clean the whole first half of the map effortlessly.
In the end, my Oujay turned out to be BETTER than both Dieck & Rutger, except for his 2 SPEED deficit, he has same HP, higher STR, higher DEF, same or higher SKL and LUCK... So screw Fir, I'll stick to Oujay I guess.
Also, Allan/Allen is becoming more and more crap, he got like 10 SPD at lv 14 (lol) with 7 def. Heck even Noah has better stats by now (except for STR)... And Treck got SPD screwed as well, he doesn't even has more than Noah wtf. Oh well :D