Row Manipulation TSQL

col1 col2 col3
1 IN NULL
2 FOR 1
3 Small 4
4 World 1
5 Hj 1
6 NJ 1
7 Welcome 1
8 So 4
9 We 1
10 Are 1
11 Resp 3
12 OIJIOJPOJPJO 7
13 OIJOIJ 1
14 LKJ 2
15 IJ 1

Is there any way, to query the above table which returns me all the 1's inside col3 until it finds any other number than 1 + the previous row preceding the 1

for eg., my 1st set would be
1 IN NULL
2 FOR 1

2nd set would look something like this
3 Small 4
4 World 1
5 Hj 1
6 NJ 1
7 Welcome 1

3rd set
8 So 4
9 We 1
10 Are 1

4th Set
12 OIJIOJPOJPJO 7
13 OIJOIJ 1

and the last set
14 LKJ 2
15 IJ 1

Any help is appreciated!!