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I apply the jittering jets in cooling flow scenario to explain theperpendicular to each other and almost coeval two pairs of bubbles in thecooling flow galaxy cluster RBS 797, and conclude that the interaction of thejets with the cold dense clumps that feed the supermassive black hole (SMBH)takes place in the zone where the gravitational influence of the SMBH and thatof the cluster are about equal. According to the jittering jets in cooling flowscenario jets uplift and entrain cold and dense clumps, impart the clumpsvelocity perpendicular to the original jets' direction, and `drop' them closerto the jets' axis. The angular momentum of these clumps is at a very high angleto the original jets' axis. When these clumps feed the SMBH in the nextoutburst (jet-launching episode) the new jets' axis might be at a high angle tothe axis of the first pair of jets. I apply this scenario to recentobservations that show the two perpendicular pairs of bubbles in RBS 797 tohave a small age difference of <10Myr, and conclude that the jets-clumpsinteraction takes place in a distance of about 10-100 pc from the SMBH.Interestingly, in this zone the escape velocity from the SMBH is about equal tothe sound speed of the intracluster medium (ICM). I mention two other clustersof galaxies and discuss the implications of this finding.

Jittering jets by negative angular momentum feedback in cooling flows