@HamstrongMoments before his opponent burst through the debris cloud sent up from Starscream's missiles, Grimlock reached out and plucked the energon cube from the ground. He blocked the attack, and at the same time his glowing parts shone brighter for a moment. Sam would be privileged for a moment to see Grimlock's wounds begin to slowly close as the Energon coursed through his body. At the same time, he through all his weight into the shield, batting his opponent away. ((Kind of like batting a baseball))
However, his moment of triumph was negated instantly as some creature nearby activated an electronic pulse. He roared out in pain as his sensor were overpowered by the burst. It coursed through is body, and he would have very likely died if it had not partially bounced off his shield, and had he not had the energon. Of course, he was now vulnerable once more, as he didn't have the strength to fight for any period of time.
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Unfortunately for Starscream, his search for his target would abruptly come to an end. He detected the beginnings of a massive electronic pulse, something he had no interest in being near. With this kind of threat looming, the massive brute would just have to be on his own. No way was he being that generous!
Turning around, he quickly put all his power into his engines. A few seconds and the outskirts of the wave were almost upon him. A few more and he was within the wave. He could feel his circuits being slowly fried, it was incredibly painful. A loud boom followed behind him, rattling the buildings and creating cone shaped cloud coming of his jet form. Breaking the sound barrier had managed to put him in front of the wave, and he was soon glad as it seemed to have fallen behind and dissipated. However, he was now quite the distance away from Grimlock and the original source of the burst. It would be a pain to have to fly around to return.