Arthur didn't call off his assault or waited for the result of the toxin and antidote analysis. He wanted to consume the strength of his enemies during that time.
After all, the enemies weren't sitting idle. The islands kept following the cannons and ground troops, trying to smash them all.
In addition to that, the reinforcements were drawing closer to here with each passing hour.
As Arthur knew the research about the toxin and the antidote might take days, he couldn't possibly call off the assault and wait.
So he let his troops attack and smash the shields of these islands before getting poisoned by the toxin.
'Are we going to keep this?' Gege asked, 'so far the strength of these islands seemed to be weakened. The time for the shield regeneration tripled already and the toxin inside needed a long time to affect our troops. But we are losing a lot already.'
