Alexander, who was observing the ongoing battle from atop the bridge found the fight to be going quite well for him.
The legionaries fought bravely and the lines up till now showed little signs of buckling, appearing very strong and robust.
Things were going so well in fact that the usually prudent man even brushed aside Hemicus's concerned urging, who had tried to make Alexander retreat by saying,
"Alexander! This is not safe. Fighting on this small bridge…. it's too easy to get trapped. Let's retreat when we can! Leave here to the men and let's go secure the island."
Seeing that things were going very well for them now, the man wanted to capitalize on it when they had the chance.
And the potential risk as dictated by Hemicus was also something that Alexander himself had thought of when he had seen Lord Bernard's ships for the first time.