By kicking a chair?! What am I missing .
One from methods usable in some cases and sitiations is to slow down opponent's intent to close distance etc. For this purpose all awailable items might appear to be usable.
If in area between you and opponent is chair, usually excepted from you action might be that you will attempt to grab stuff and hit head...with ofc predictable movements...
More rare cases when it is used as some kind of short term shield or kicked in order to hit your legs...complicated things sometimes are very simple.
Grappling elements are usable to establish control if you managed to apply proper grips or in oder to disbalance attacker with intent to remain in standup position while he is down...definitely not to roll on the ground on da tech street where someone else might easily process you when you are rolling on the ground with some guy....
Cuts, I don't talk here about supraficial stuff like 1/10 inch deep things. Cuts might be 1 inch and more than this ....especially if knife is used as something like small sword blade....
So the same neck and some other areas...they might be fatal....
Ofc stabbing type attacks are prefered but ....if you do not have position etc to properly stab...you might to cut deeply in some cases. Also who had told that if you have knife then automatically you don't have legs, elbows, head, knees, another hand...or maye you might have 2 knifes?
Ofc we should know that if someone is fighting for life, he might use everything....