I have a question about Horatio

I didn't see this mentioned before on here, but I had a real problem in the scene were Gulliver was still in the Dollhouse wearing the Dress and all of a sudden Horatio shows up wanting him to return to the Island. How in the heck did he know where Gulliver was and how the heck did he get there? That giant girl swooped Gulliver up and put him in her Dollhouse but how was Horatio even to know that? I am sure there were tons of houses on this Island just like on the small Island and it didn't seem like the giant girl had captured Horatio so how did he know in which House Gulliver was in? Also, how did Horatio even get in the house in the first place and so fast? They both needed the Parachute just to get down off the House which made this house huge to Gulliver and even more huge to Horatio. This scene just wasn't made too well to make sense.