I see two possibilities with pulling an item crossing a speed bubble, both of which say (almost) nothing happens.
1. It cannot happen, the bubble warps itself to either include or exclude any discrete item. This could have the side effect of deflecting and changing the speed of moving objects, like bullets.
2. The large change in momentum would increase the amount of force needed to move the table (that sticks out of a Bendalloy bubble). I think it would be about 100x as hard (assuming 100x speedup of time) to accelerate an outside object (or part of one) from inside of the bubble as outside of it, because it would be moving that much faster in the outside world. most objects are not that strong, so they would break at the edge of the bubble.
I'm not sure about either of these ideas, especially with such limited information to go off of, but I think #2 is better at least.
Yeah #2 does sound better, as it would seem to require less Scadriel-Laws of Physics-distortions, but it would still seem to bring up a couple things that would seem important for Wayne.
The ones that I can think of are that if you ever caught somebody's sword only halfway in a speed bubble (Vin was using a sword taller than she was in one of the books) and it wasn't mid-swing, having their sword suddenly become 100x heavier would basically ruin them. Of course that's probably not a super common situation but also, if you were fighting in a speed bubble (to make it harder for outsiders to interfere) then any halfway-in objects, instead of being thrown out of the way, would basically work the same as walls and make pins, headsmashes, etc. so much more effective in a way that you couldn't really ignore. Also if somebody was pushing something large or holding onto somebody falling off the edge of the cliff, catching all of them but only half of the object or person would make it basically impossible for them to push the object, and magnify the force of gravity (since that's what is really holding any of these objects in place in the first place) to pull the cliff-dangling guy out of his rescuers hands or, if the rescuer didn't let go, to pull him with him.
Also, for that matter, what about catching a person half-in, half-out? If #2 really holds true, the effect on their internal seems like possible death, or failing that the effect on their perception would at least be incredibly disorienting.
Since those are just like throwing some out there off the top of my head, it just seems that any way you spin it the edge of the speed bubble has to have a bunch of minor implications that cumulatively add up to being fairly major.