One of Jack's punches hit a sweet spot on Alex's rib cage, causing him to stagger for a moment due to the pain. He made use of that opening and delivered a fast and heavy blow to the face, sending Alex tumbling to the ground.
After rolling a few meters he used the momentum to bounce up onto his feet and immediately launch a counter attack. Six icicles materialized in front of Alex's outstretched hands and flew threw the air at Jack.
The speed of these icicles was by no means slow but for someone with a speed based ability it wasn't at the level where it was difficult to dodge. Jack charged directly at the icicles, harmlessly weaving his way through them with ease and continuing forwards after.
He dashed towards Alex faster than before and lifted his fist, confident that Alex wouldn't be able to block him at this speed. When the distance was right he launched his fist at Alex's face, putting his full force into the attack.