This situation is not good for either party. If i had a magic wand, i would have K. Yamaguchi, who is well respected, lives in the area, and knows both Chen and Avanta, get all parties together, be moderator, and help both sides to sort this situation out! Something went terribly wrong, and there is always a possibility some "third party rumor/involvement" might have caused this intensity. Yago/Othello/Desdemona situation... sort of.
I have issues, actually, with both parties/sides... Karen's foto of the damaged boot in the tweet was VERY deliberate.. it was not the kind of "oh, look, my boot is damaged" foto taken on a spare of the moment out of emotions and concerns.. It is a very crafty foto! with art-work, shade enhancement, artistic lettering... it's almost like an advertisement... what for? Given there are plenty of mentions about Karen using Avanta's boots (on ice-network, EastBay press, Avanta's website, and other print media), i can see how Avanta saw a direct connection between that tweet and their brand name. I can see very well, how Karen's tweet can be viewed as passive-aggressive.. She does not mention the brand-name, but everyone in the skating world knows the boots are Avanta. Avanta sees it as a ploy and an attack on them after giving her ~17 pairs of free boots... I can also imagine "All About Eve" situation, she is so innocent and all she did is asked people to pray for her because of bad boot... but the setting of the WHOLE situation is not that cut and dry..
Avanta's reply, on the other hand, is unprofessional and ineffective. Not because they don't possibly have a legitimate concern, but because the form and method they used does NOT solve any problems for either party.
Someone needs to moderate them, and hear each side of the story (in private of course), and make peace. Like we say in Russia: sickly peace is better than a healthy fight...