When belaying with Munter hitch, aside from always holding the break strand, belayer should pay attention to keep fingers at a respectful distance from the knot, otherwise he might risk jamming his fingers into the belay, which might result in a severe finger injury. Belayer should also ensure to tie the Munter in a way that it does not interfere with the carabiner gate/lock. Otherwise the rope friction might unlock, and maybe even open the gate of the carabiner.
Translations:Munter hitch/18/en: Difference between revisions