It's a giant...bellsprout?
"oh, thank goodness. It's just a bellsprout. they only eat bugs..."
It looks down at you, and you notice that it's drooling. You now notice that because of the difference in your sizes, you must look like a large bug to this bellsprout... uh, oh... you turn around and try to run, but this bellsprout is experienced in catching fast prey... It grabs you in it's bulb-mouth and quickly starts to suck you in.any amount of struggling at this time would be pointless, it's sucking you down very quickly now...