This section of miracles in Matthew reflects Jesus' command of the elements, supernatural, and diseases. He sent the demons into swine, which killed themselves. He healed the sick. Jesus' command is the ultimate power in the Universe.
Stephen's martyrdom speaks of Israel's failure to do things on the first try. The sons of Jacob had two chances to accept Joseph and did it on the second chance. Israel accepted Canaan on the second attempt. On the same note, Israel will accept Jesus at His Second Coming and did not do it widely on the first. Family of mine accept that Israel is beginning to accept Jesus now, as He is preparing to return.