Thank you Michl,
I was already pondering about the possible ways to hurl these grenades around, but i had no clue about relevant sources until i found this manuscript.
The 'red' grenade on the second image of your above post, is this some sort of rope with a grenade at the end which was hurled trough the air like a scottish highland game (sorry for the weird phrasing).
and the grenades at the bottom of the same picture, do they have secondary charges inside metal containers/explosives (there seems to be a little hole in each of the grey tubes).
Best,
Marcus