Do you suggest to trade without a stop loss?
Depends on which method a trader is using, if executing arbitrage, it requires a different set of calculations. If using cut-loss-ride-profits method I wouldn't dare not putting a stop loss there in case there is a big plunge or surge in the opposite direction. If targeting a temporary divergence I would still put a stop there in case my computer breaks down and I can't re-establish the connection fast enough to take profit nor cut loss.
Specify, please.
From 116,21 to 115,17 is about 36-thirty-seconds, ie. the trader will be risking US$1125.
If a trader has only US$1125 in his trading account, assuming the broker allows the trader to initiate a position because the day trading margin is sufficient, he will most probably be calling the trader for margin based on the volatility of the T-Bond. The probability of the trader surviving beyond 3 rounds based on such an amount in his trading account, will be very low. If he gets wiped-out in the first round he will not see round 2.
Based on what I can recall of the entry signalers in the 1990's, I think they described it as "playing the technicals", eg. "support seen at", "if support broken next support is," etc. That is, they don't guarantee that something will happen (maybe they don't want to get sued for breach of warranty etc.).