Nick, I think that is what was so messed up, Eli put out 200, dealer said complete but it should have only been 100. At this point the dealer should have slid the extra 100 chip back to the player but it appears he did not.
Frank sees 200, thinks 200 is the bet, then puts out 200 intending to call.
Since Eli's bet really should have only been 100, not 200, Frank's 200 is being viewed as a raise in this example.
My floor call? Bet is 200 and let's go to 4th street. Reason? Eli may not have been able to make it 200 but both Eli and Frank have shown that they are each amenable to playing for 200 so the least damaging thing I can do is to have them both continue to the next street for 200. At one point both Frank and Eli had 200 in chips sitting in front of them. By allowing Eli the chance to make it 300 we may have been unwitting accomplices to Eli's original intended angle shot for all we know.
The other two floor calls that could be done:
A) Eli's original bet is ruled 100 and since Frank says he didn't want to raise, we make Frank put in 100 instead of 200 and go to 4h street. I'd be ok with this one.
B) Chips is chips, and bets is bets. Eli completed to 100, Frank raised to 200, now Eli makes it 300 and action is reopened. I don't like this one.