The bystander effect may be defined as the psychological effect that might discourages the individual from intervening in the situation. The individual take more positive action in case of crisis only.
The greater the chance of the bystander the lower the chance to get help in the distress. As described the situation in the question, Eddies' behavior is not controlled by the bystander effect as he immediately went to get help from the other people.
Thus, the answer is- not constrained by the bystander effect.
