The original wording above says "Do not stand in front of the bigger head".
Two reasons:

 1. There is a Kaktus precision gamma-ray altimeter (Containing <sup>60</sup>Со or  <sup>137</sup>Сs).
 2. There is a chance of one of the soft landing engines firing late due to malfunction.


  [1]: http://www.spacesafetymagazine.com/spaceflight/reentry-descent-landing/soft-landing-on-kaktus/