Boot Camp Hung while deleting a partition

I'm not sure what you mean by "If you only see disk0s3, then" as you can see from the listing that disk4 is the bootcamp disk. But I was able to restore it to a single partition with bootcamp. Thanks!!

Yes it worked fine.

Jonathans-MacBook-Pro:~ j$ diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4

Merging partitions into a new partition

Start partition: disk0s3 BC1

Finish partition: disk0s4 BC2

Started partitioning on disk0

Merging partitions

Waiting for partitions to activate

Growing disk

Finished partitioning on disk0

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 1.0 TB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 892.0 GB disk0s2

3: Apple_HFS BC1 108.1 GB disk0s3

Jonathans-MacBook-Pro:~ j$ diskutil list

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 1.0 TB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 892.0 GB disk0s2

3: Apple_HFS BC1 108.1 GB disk0s3

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +892.0 GB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 333.9 GB disk1s1

2: APFS Volume Preboot 21.5 MB disk1s2

3: APFS Volume Recovery 519.0 MB disk1s3

4: APFS Volume VM 2.1 GB disk1s4

/dev/disk2 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: ESD-ISO +6.0 GB disk2

/dev/disk3 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: CCCOMA_X64FRE_EN-US... +4.7 GB disk3

/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: Boot Camp +881.4 MB disk4

Jonathans-MacBook-Pro:~ j$ diskutil eraseVolume fat32 BOOTCAMP disk0s3

Started erase on disk0s3 BC1

Unmounting disk

Erasing

4096 bytes per physical sector

/dev/rdisk0s3: 26386608 sectors in 3298326 FAT32 clusters (32768 bytes/cluster)

bps=4096 spc=8 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=217850368 drv=0x80 bsec=26393088 bspf=3222 rdcl=2 infs=1 bkbs=6

Mounting disk

Finished erase on disk0s3 BOOTCAMP

Jonathans-MacBook-Pro:~ j$ diskutil list

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 1.0 TB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 1.0 TB disk0s2

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +1.0 TB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 334.3 GB disk1s1

2: APFS Volume Preboot 21.5 MB disk1s2

3: APFS Volume Recovery 519.0 MB disk1s3

4: APFS Volume VM 2.1 GB disk1s4

/dev/disk2 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: ESD-ISO +6.0 GB disk2

/dev/disk3 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: CCCOMA_X64FRE_EN-US... +4.7 GB disk3

/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: Boot Camp +881.4 MB disk4

Jonathans-MacBook-Pro:~ j$ diskutil list

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 1.0 TB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 1.0 TB disk0s2

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +1.0 TB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 334.7 GB disk1s1

2: APFS Volume Preboot 21.5 MB disk1s2

3: APFS Volume Recovery 519.0 MB disk1s3

4: APFS Volume VM 2.1 GB disk1s4

/dev/disk2 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: ESD-ISO +6.0 GB disk2

/dev/disk3 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: CCCOMA_X64FRE_EN-US... +4.7 GB disk3

/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: Boot Camp +881.4 MB disk4

Jonathans-MacBook-Pro:~ j$

[Restored Sep 4, 2018 at 7:52:40 PM]

I forgot to paste the list from terminal and now it has rebooted to install windows. But disk4 was still there prior to restoring to a single partition with boot camp.