Professional bettors and sportsbooks respond to steam moves by closely monitoring line changes and betting patterns to gain a competitive edge. Professional bettors often act quickly when they notice a steam move, placing their wagers before the lines adjust further, especially if they believe the move indicates a favorable opportunity or reflects valuable information they can exploit. On the other hand, sportsbooks typically respond by adjusting their lines to manage risk; they may widen the spread or shift the line to attract balanced action on both sides and mitigate potential losses.