John Gill Commentary 2 Kings 5:21

"So Gehazi followed after Naaman. And when Naaman saw one running after him, he alighted from the chariot to meet him, and said, Is all well?" — 2 Kings 5:21 (ASV)

So Gehazi followed after Naaman. As fast as he could:

and when Naaman saw him running after him; which he might observe, looking back, or be informed of by some of his servants:

he lighted down from the chariot to meet him; in honour to the prophet, whose servant he was:

and said, is all well? fearing something ill had befallen Elisha; or he himself had done something wrong, which occasioned the servant to run after him.