[Stings]

After reading this thread i'm curious at hwhat the correct ruling on this situation that occured at my local indian casino (pechanga) a couple of weeks ago. its 5/10 uncap game and theres a raise pf by player A, and two callers. On the flop, its monotone spade board, B and C check, player A bets $250, B folds, C announces raise and grabs a handful of $10 chips (but not enough for a legal raise, like 35-40 chips). As he is cutting his chips, player A announces (I'm gonna call whatever you raise), which confuses player C and he has $300 out there, instead of $250.

Obviously Player C has to
1) raise
2) didnt have enough chips to do a legal raise, so he was either gonna
2a) place $250 out there and then pull back to grab more chips for his raise amount
2b) announce an amount while cutting his chips

so i have two questions

1) since player C announce raise and placed $300, is he only able to place the minimum raise?
2) is player A's required to call whateva C's raise is.

thanks.