@ Demi
Sturdy enough to keep the pressure going outside, on the other hand, it was so fragile that firing the cannon at close range BLOW the cannon altogether due to feedback force
The principle is similar to a balloon actually.
We might be able to add some armor into impact cannon in that case. Still, throwing them around just feels weird.
As for Souten Gagetsu, we can have either longer stick (making it a full-fledged spear/halberd) or chain to make a heavy blade flail weapon (channeling Kratos FTW)
@ Eras
Why do you think Ichika is EXTREMELY PISSED when Rin thrown her blade in Sacred Twins?