People underestimate the hardiness of BTA's, as long as the water quality is up to par and sufficiant lighting is supplied, I see no reason why these particular anemones shouldnt make a full recovey in time. The only problem I can see is the clown bwing overly aggresive and hindering its ability to heal properly. Id give them a week or two to heal before attemptoing to feed, and then only small pieces of silversides.
Good luck!