[PP] [MA] Unobvious advantages and limitations of TK Grab in combat

[Thökk]

I read TK grab carefully and came to conclusion that with a decent level (10 and up, especially short range version) and decent IQ it can be quite a serious brawling, judo, wrestling opponent.

It has its level in BM, it has its level in ST, It has your IQ in DX.
It doesn't have HT or HP. It gets certain benefits of being invisible.
It can't be hit or damaged, it can't be thrown away (unless you hold an object or weapon to hit), it doesn't(shouldn't?) have disadvantages from sitting, lying as it is just you moving your TK Grab around, it doesn't have anatomy or space, it can perform maneuvers that otherwise risk injuring you or maneuvers that otherwise require you to have long preparation, risky positionioning from climbing or even space that you wouldn't be otherwise able to fit in (pulling somebody by their ankles off the ledge, pushing or pulling somebody into a line of fire or active hazard, like fire, electricity, water, etc.). On the other hand TK Grab doesn't have a body or legs to leverage.

All in all, I think, how and where you can apply force (whilst being invisible) should significantly impact what you can achieve.

But I am not very knowledgeable about GURPS rules (or physics, really, it's just all intuitive assumptions above), so I want to challenge my assumptions and ask you all what are some "hidden" advantages and disadvantages a TK Grab brawler/wrestler/Judo adept has compared to a human one. Are there some tips fleshy opponents can benefit from or trick to pull off against TK Grab? Can a Psychokinetic develop a new Style and set of Techniques for TK-assisted martial arts?