you are propably getting shot at by a killer or a thug
1. It wasn't against dedicated killers.
2. Thugs don't shoot all of a sudden, they are very visible and loud.
, from behind, without visual contact first, and in combat situations on the warfield it would be too big and unpractical to use, would immobilise the user when in usage, require immense physical power for stabilisation while getting shot at
I was thinking about it being more of a offensive weapon with defensive Bonus. Also one could balance out the whole thing by putting a weight at/in/as the Handle, like it is done with Swords.
useless against any type of explosive munitions.
I was not intending to fight a Tank or Missile Launcher with an Umbrella.
Good ways to use it would have been (if it worked):
Charging at the Enemy with the Umbrella as Shield.
If the Umbrella has a slightly pointy Spike at its end you can even stab someone with it.
Protection against Grenade Fragments would also be possible.