During a catch, as the #booster comes in, both arms close quickly and possibly hit the booster right on the methane tank. The booster then slides down the sticks until the lift pins contact the landing rails, helping slow the booster down and acting as a shock absorber. Then, the pins rest in the inserts, and the engines shut down. Teams have also installed a new set of bumpers made of a compressive metal structure rather than foam or rubber. https://www.nasaspaceflight.com/2024/08/starbase-pad-b-tower-stacked/