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Short question regarding interactables in MKX

So I saw AI and some players use some intectables in a way it looked like they were sliding through them. For example that fetus in quan chi's fortress and perhaps a a flaming cannister in that "special forces" stage. Sry guys don't know the exact stage name cause I don't care much about stages...but I believe you know what I'm talking about. As I said about that sliding through, is this only specific to certain characters? I currently play only sub and goro (lack of time, I need a lot of time to really master a certain character and don't wanna go on before I feel really confident with a char).

So yeah, what's the deal with that strange sliding? I can only throw those interatables and ex them.
Another question: I saw some people also implementing interactables into combos. Any advice on how to do that and if it's actually a valid strategy to use on a regular basis?

Gracias