Will Jimmy fall off his platform?
Jelly, 6 bytes

n⁶Sċ2Ẓ


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Explanation:

n⁶Sċ2Ẓ  args: z (e.g. [['/', 'o', '\\'], [' ', '-']] =&gt; 0)
        implicit return value: z ([['/', 'o', '\\'], [' ', '-']])
n⁶      dyad-nilad pair ([[1, 1, 1], [0, 1]])
 ⁶       4th command-line argument or space [4th CLA assumed absent] (' ')
n        vectorized inequality ([[1, 1, 1], [0, 1]])
  S     reduction by addition with base case 0 ([1, 2, 1])
   ċ2   dyad-nilad pair (1)
    2    literal (2)
   ċ     number of occurrences of right in left (1)
     Ẓ  primality (0)