Knuckles knew he couldn't dodge them for much longer, so he charged and punched Metal Sonic's steel body. It didn't hurt him. it didn't even scratch him. Knuckles ran in front of the master emerald, he wasn't going to give up without a fight first.
Metal Sonic just laughed.
"Pathetic!" growled Metal Sonic, "Just pathetic"
Metal Sonic was determined to kill Knuckles,
and destroy the master emerald too.

"If you destroy this emerald, we'll both be destroyed!" said Knuckles.
"NO! Only you will be... I will be fine. NOW DIE!" and Metal Sonic lazer beamed Knuckles.
He knew that if that hit him, he'd die, but if he dodged, the master emerald would be destroyed ... forever...