Imagick将外部图像解释为HTML

The problem I'm having is that when saving an image from a specific external website (not all websites), I get an error where the image is interpreted as html and not as another image format.

So far, this website is the only site that I've experienced this problem on, but I definitely need to find a solution.

Link to the images: http://www.nycvelo.com/bike-of-the-week-nicks-geekhouse-commuter/

An image to test with: http://www.nycvelo.com/wp-content/uploads/2013/10/Nicks-Geekhouse-7.jpg

Code from line 86:

$imageURL = 'http://www.nycvelo.com/wp-content/uploads/2013/10/Nicks-Geekhouse-7.jpg';

// Get image file from imagick
$ImagickImage = new Imagick($imageURL);

Error:

Fatal error:  Uncaught exception 'ImagickException' with message 'no decode delegate for this image format `HTML' @ error/constitute.c/ReadImage/535' in uploader.php:86
Stack trace:
#0 uploader.php(86): Imagick->__construct('http://www.nycvelo.com/wp-content/uploads/2013/10/Nicks-Geekhouse-7.jpg')

As far as I can tell, there is no "html" delegate in the first place, nor would it make sense to have one, so perhaps this requires a solution outside of ImageMagick/Imagick?

Update

I ran a test on the file to see what headers were sent back and this is what I got after using file_get_contents.

array(9) {
  [0]=>
  string(15) "HTTP/1.1 200 OK"
  [1]=>
  string(23) "Content-Type: text/html"
  [2]=>
  string(17) "Connection: close"
  [3]=>
  string(23) "Cache-Control: no-cache"
  [4]=>
  string(17) "Connection: close"
  [5]=>
  string(20) "Content-Length: 6195"
  [6]=>
  string(81) "X-Iinfo: 5-12048231-0 0CNN RT(1434509018550 6) q(1 -1 -1 -1) r(1 -1) B10(4,289,0)"
  [7]=>
  string(163) "Set-Cookie: visid_incap_264353=osbiSagORl2MGqb2cebUn9regFUAAAAAQUIPAAAAAAAUiLr5I31XtpMPuiNCWNQH; expires=Thu, 15 Jun 2017 13:43:05 GMT; path=/; Domain=.nycvelo.com"
  [8]=>
  string(118) "Set-Cookie: incap_ses_239_264353=XJXubnJwpRuBGVGGahpRA9regFUAAAAAbY2asXWHPVkKb5NEpRJyXg==; path=/; Domain=.nycvelo.com"
}