Aldous Hack:
Tip Slash is a technique? Is there a skill penalty?
Not a technique. As I mention above, no skill penalty. All it is is another way to attack with an impaling weapon, it does less damage, thrust damage -2 (-1 if it's a spear that isn't an "long spike", so... most spears) and counts as cutting, and swing for "constricted space purposes" only.
So, frex a Dagger which does thr-1 imp, does thr-3 cutting if you Tip Slash. In this case say you're trying to cut a rope (Homogenous), you might be better off trying to Tip Slash it for cutting damage rather than dealing 1/2 damage rounded down to it, even though you're taking a large penalty to your roll. Or if you're fighting a creature that is Homogeneous (and various Injury Tolerance like No Brains, No Vitals, etc) when you have a Rapier, you'd
might be better off doing thr-1 cutting than one half thr+1 impaling.
The only reason to usually chose to tip Slash is if you really need to do
cutting damage, or have no way to do crushing damage, r crushing damage would be even less effective. Like the afore mentioned rope, whacking it with the spear's butt is not really going to accomplish anything, but sawing on it with the tip...
And this concludes today's lesson on why you should carry a backup weapon that does a different type of damage from your main weapon. I expect everyone to do the reading assignment and write 3 1/2 inches on "Why everyone should carry a Reach C weapon as a backup" by the end of class Friday...