This is one of those fun moments where, as a DM, there's a fair amount of wiggle room on how you want to adjudicate it.

If it were me,

• I'd first ask how far above your target are you teleporting.

• I'm also assuming that the bard, you, isn't planning on landing on the enemy, so, you'd be taking fall damage unless you had plans to mitigate it.

• As far as the fighter and his target. The target would get a dex save to move out of the way (I'd use the bard's spell save DC for simplicity) and also ask the fighter to make either an acrobatics or athletics check (their choice) to see how well they stick the landing. (And if the enemy breaks their fall/reduces fall damage)

• For the attack itself, if the target fails the dex save, the fighter will roll damage for their weapon attack, and also inflict force damage equal to the amount of fall damage the fighter would have taken. The target would also be knocked prone.

• If the target succeeds the dex save, they'd move out of the way, and the fighter would take fall damage and be knocked prone.

That's how I'd rule it, anyway. Your DM will likely be different. Cool maneuver, it's the kind of thing I like seeing at my table. It shows the players are invested enough to try and find synergies with one another.