You cannot teleport into close combat with a hidden figure, because you cannot attack a hidden figure.
You can teleport into cc with a figure that is not hidden, but you don't need to have LOS to the target.
There was a constant problem with CC and hideden figures so we made a homerule:
- Attacker (not hidden) moves through Defender (not hidden) - charge
- Attacker (hidden) moves through Defender (not hidden) - sneak attack
- Attacker (not hidden) moves through Defender (hidden) - defenter can choose to let him through or make a sneak attack (if was waiting 2 attacks)
- Attacker (hidden) moves through Defender (hidden) - they pass through not konowing about themselves
When Attacker moves through defender and they do not initiate combat they must end their move without touching their bases.