This total isn't high enough even if both teams weren't missing their top low-post scorers. 
San Antonio is averaging 110.8 pts in its last five games. The Spurs are a better defensive team than offensive team. They also are without LaMarcus Aldridge. That means big minutes for Jakob Proeltl, an Under bettor's delight - a shot-blocker with a limited offensive game and a terrible free throw shooter. 
The Rockets have become a defensive team-first under Stephen Silas. Houston ranks in the top-six in many of the major defensive categories, including scoring, field goal percentage and 3-point percentage. Houston has surrendered just 103 points per game during its last eight games.
The Rockets are without their leading scorer, Christian Wood. Not only was Wood averaging 22 points, but he was shooting 55.8 percent from the field. 
The team's met twice in mid-January. Both games went Under with a combined scoring total of 214 and 194 in those games.